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38-426: Prow may be used as a synonym for bow or it may mean the forward-most part of the bow above the waterline. A ship's bow should be designed to enable the hull to pass efficiently through the water. Bow shapes vary according to the speed of the boat, the seas or waterways being navigated, and the vessel's function. Where sea conditions are likely to promote pitching , it is useful if the bow provides reserve buoyancy ;

76-419: A derivative . A derivative is one of the words which have their source in a root word, and were at some time created from the root word using morphological constructs such as suffixes, prefixes, and slight changes to the vowels or to the consonants of the root word. For example unhappy , happily , and unhappily are all derivatives of the root word happy . The terms root and derivative are used in

114-475: A suffixed etymon that was once meaningful, Latin castrum ' fort ' . Reflex is the name given to a descendant word in a daughter language, descended from an earlier language. For example, Modern English heat is the reflex of the Old English hǣtu. Rarely, this word is used in reverse, and the 'reflex' is actually the root word rather than the descendant word. However, this usage is usually filled by

152-476: A comprehensive and chronological catalogue of all meanings and changes that a word (and its related parts) carries throughout its history. The origin of any particular word is also known as its etymology . For languages with a long written history , etymologists make use of texts, particularly texts about the language itself, to gather knowledge about how words were used during earlier periods, how they developed in meaning and form , or when and how they entered

190-531: A curved prow. Many types of bows exist. These include: From Middle Dutch boech or Old Norse bógr (shoulder). Thus it has the same origin as the English "bough" (from the Old English bóg , or bóh , (shoulder, the bough of a tree) but the nautical term is unrelated, being unknown in this sense in English before 1600. The "prow" (French : proue ) is the forward-most part of a ship's bow above

228-494: A flared bow (a raked stem with flared topsides) is ideal to reduce the amount of water shipped over the bow. Ideally, the bow should reduce the resistance and should be tall enough to prevent water from regularly washing over the top of it. Large commercial barges on inland waterways rarely meet big waves and may have remarkably little freeboard at the bow, whereas fast military vessels operating offshore must be able to cope with heavy seas. On slower ships like tankers and barges,

266-480: A fuller bow shape is used to maximise the volume of the ship for a given length. The bow may be reinforced to serve as an ice-breaker. The forward part of the bow is called the "stem" or "forestem". Traditionally, the stem was a timber (or metal) post into which side planks (or plates) were joined. Some boats such as the Dutch barge "aak" or the clinker-built Viking longships have no straight stem, having instead

304-955: A high standard with the German Dictionary of the Brothers Grimm . The successes of the comparative approach culminated in the Neogrammarian school of the late 19th century. Still in the 19th century, German philosopher Friedrich Nietzsche used etymological strategies (principally and most famously in On the Genealogy of Morals , but also elsewhere) to argue that moral values have definite historical (specifically, cultural) origins where modulations in meaning regarding certain concepts (such as "good" and "evil") show how these ideas had changed over time—according to which value-system appropriated them. This strategy gained popularity in

342-498: A truth ' , and the suffix -logia , denoting ' the study or logic of ' . The etymon refers to the predicate (i.e. stem or root ) from which a later word or morpheme derives. For example, the Latin word candidus , which means ' white ' , is the etymon of English candid . Relationships are often less transparent, however. English place names such as Winchester , Gloucester , Tadcaster share in different modern forms

380-408: Is called pitch . Pitch changes the vertical direction that the aircraft's nose is pointing (a positive pitching motion raises the nose of the aircraft and lowers the tail). The elevators are the primary control surfaces for pitch. The roll axis (or longitudinal axis ) has its origin at the center of gravity and is directed forward, parallel to the fuselage reference line. Motion about this axis

418-481: Is called roll . An angular displacement about this axis is called bank . A positive rolling motion lifts the left wing and lowers the right wing. The pilot rolls by increasing the lift on one wing and decreasing it on the other. This changes the bank angle. The ailerons are the primary control of bank. The rudder also has a secondary effect on bank. The principal axes of rotation imply three reference planes , each perpendicular to an axis: The three planes define

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456-440: Is called yaw . A positive yawing motion moves the nose of the aircraft to the right. The rudder is the primary control of yaw. The term yaw was originally applied in sailing, and referred to the motion of an unsteady ship rotating about its vertical axis. Its etymology is uncertain. The pitch axis (also called transverse or lateral axis ), passes through an aircraft from wingtip to wingtip. Rotation about this axis

494-616: Is known. The earliest of attested etymologies can be found in Vedic literature in the philosophical explanations of the Brahmanas , Aranyakas , and Upanishads . The analyses of Sanskrit grammar done by the previously mentioned linguists involved extensive studies on the etymology (called Nirukta or Vyutpatti in Sanskrit) of Sanskrit words, because the ancient Indians considered sound and speech itself to be sacred and, for them,

532-423: Is not readily obvious that the English word set is related to the word sit (the former is originally a causative formation of the latter). It is even less obvious that bless is related to blood (the former was originally a derivative with the meaning "to mark with blood"). Semantic change may also occur. For example, the English word bead originally meant "prayer". It acquired its modern meaning through

570-528: Is often traced to Sir William Jones , a Welsh philologist living in India , who in 1782 observed the genetic relationship between Sanskrit , Greek and Latin . Jones published his The Sanscrit Language in 1786, laying the foundation for the field of Indo-European linguistics . The study of etymology in Germanic philology was introduced by Rasmus Christian Rask in the early 19th century and elevated to

608-584: Is similar to the Frenet–Serret formulas . Performing a rotation in an intrinsic reference frame is equivalent to right-multiplying its characteristic matrix (the matrix that has the vectors of the reference frame as columns) by the matrix of the rotation. The first aircraft to demonstrate active control about all three axes was the Wright brothers ' 1902 glider . Etymology Etymology ( / ˌ ɛ t ɪ ˈ m ɒ l ə dʒ i / , ET -im- OL -ə-jee )

646-552: Is the most absurd, which derives this word from pons, and assigns the priests the title of bridge-makers. The sacrifices performed on the bridge were amongst the most sacred and ancient, and the keeping and repairing of the bridge attached, like any other public sacred office, to the priesthood. Isidore of Seville compiled a volume of etymologies to illuminate the triumph of religion. Each saint's legend in Jacobus de Varagine 's Legenda Aurea begins with an etymological discourse on

684-435: Is the study of the origin and evolution of words, including their constituent units of sound and of meaning , across time. In the 21st century a subfield within linguistics , etymology has become a more rigorously scientific study. Most directly tied to historical linguistics , philology , and semiotics , it additionally draws upon comparative semantics , morphology , pragmatics , and phonetics in order to attempt

722-402: The adoption of " loanwords " from other languages); word formation such as derivation and compounding ; and onomatopoeia and sound symbolism (i.e., the creation of imitative words such as "click" or "grunt"). While the origin of newly emerged words is often more or less transparent, it tends to become obscured through time due to sound change or semantic change. Due to sound change , it

760-399: The aircraft's center of gravity . These axes are related to the principal axes of inertia , but are not the same. They are geometrical symmetry axes, regardless of the mass distribution of the aircraft. In aeronautical and aerospace engineering intrinsic rotations around these axes are often called Euler angles , but this conflicts with existing usage elsewhere. The calculus behind them

798-423: The analysis of morphological derivation within a language in studies that are not concerned with historical linguistics and that do not cross the language barrier. Etymologists apply a number of methods to study the origins of words, some of which are: Etymological theory recognizes that words originate through a limited number of basic mechanisms, the most important of which are language change , borrowing (i.e.,

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836-448: The first to make a comprehensive analysis of linguistics and etymology. The study of Sanskrit etymology has provided Western scholars with the basis of historical linguistics and modern etymology. Four of the most famous Sanskrit linguists are: These linguists were not the earliest Sanskrit grammarians, however. They followed a line of ancient grammarians of Sanskrit who lived several centuries earlier like Sakatayana of whom very little

874-437: The language. Etymologists also apply the methods of comparative linguistics to reconstruct information about forms that are too old for any direct information to be available. By analyzing related languages with a technique known as the comparative method , linguists can make inferences about their shared parent language and its vocabulary. In this way, word roots in many European languages, for example, can be traced back to

912-423: The letters X, Y and Z in order to compare them with some reference frame, usually named x, y, z. Normally, this is made in such a way that the X is used for the longitudinal axis, but there are other possibilities to do it. The yaw axis has its origin at the center of gravity and is directed towards the bottom of the aircraft, perpendicular to the wings and to the fuselage reference line. Motion about this axis

950-426: The obvious, and actual "bridge-builder": The priests, called Pontifices.... have the name of Pontifices from potens , powerful because they attend the service of the gods, who have power and command overall. Others make the word refer to exceptions of impossible cases; the priests were to perform all the duties possible; if anything lays beyond their power, the exception was not to be cavilled. The most common opinion

988-580: The origin of the Indo-European language family . Even though etymological research originated from the philological tradition, much current etymological research is done on language families where little or no early documentation is available, such as Uralic and Austronesian . The word etymology is derived from the Ancient Greek word ἐτυμολογία ( ἐτυμολογία ), itself from ἔτυμον ( ἔτυμον ), meaning ' true sense or sense of

1026-433: The practice of counting the recitation of prayers by using beads. The search for meaningful origins for familiar or strange words is far older than the modern understanding of linguistic evolution and the relationships of languages, which began no earlier than the 18th century. From Antiquity through the 17th century, from Pāṇini to Pindar to Sir Thomas Browne , etymology had been a form of witty wordplay, in which

1064-460: The relationship between two languages on the basis of similarity of grammar and lexicon was made in 1770 by the Hungarian, János Sajnovics , when he attempted to demonstrate the relationship between Sami and Hungarian (work that was later extended to the whole Finno-Ugric language family in 1799 by his fellow countryman, Samuel Gyarmathi ). The origin of modern historical linguistics

1102-510: The saint's name: Lucy is said of light, and light is beauty in beholding, after that S. Ambrose saith: The nature of light is such, she is gracious in beholding, she spreadeth over all without lying down, she passeth in going right without crooking by right long line; and it is without dilation of tarrying, and therefore it is showed the blessed Lucy hath beauty of virginity without any corruption; essence of charity without disordinate love; rightful going and devotion to God, without squaring out of

1140-402: The same language. Although they have the same etymological root, they tend to have different phonological forms, and to have entered the language through different routes. A root is the source of related words within a single language (no language barrier is crossed). Similar to the distinction between etymon and root , a nuanced distinction can sometimes be made between a descendant and

1178-408: The sixteenth century. Etymologicum genuinum is a grammatical encyclopedia edited at Constantinople in the ninth century, one of several similar Byzantine works. The thirteenth-century Legenda Aurea , as written by Jacobus de Varagine , begins each vita of a saint with a fanciful excursus in the form of an etymology. The Sanskrit linguists and grammarians of ancient India were

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1216-543: The supposed origins of words were creatively imagined to satisfy contemporary requirements; for example, the Greek poet Pindar (born in approximately 522 BCE) employed inventive etymologies to flatter his patrons. Plutarch employed etymologies insecurely based on fancied resemblances in sounds . Isidore of Seville 's Etymologiae was an encyclopedic tracing of "first things" that remained uncritically in use in Europe until

1254-427: The term etymon instead. A reflex will sometimes be described simply as a descendant , derivative or derived from an etymon (but see below). Cognates or lexical cognates are sets of words that have been inherited in direct descent from an etymological ancestor in a common parent language. Doublets or etymological twins or twinlings (or possibly triplets, and so forth) are specifically cognates within

1292-480: The vehicle and rotate relative to the Earth along with the craft. These definitions were analogously applied to spacecraft when the first crewed spacecraft were designed in the late 1950s. These rotations are produced by torques (or moments ) about the principal axes. On an aircraft, these are intentionally produced by means of moving control surfaces, which vary the distribution of the net aerodynamic force about

1330-440: The vehicle's center of gravity . Elevators (moving flaps on the horizontal tail) produce pitch, a rudder on the vertical tail produces yaw, and ailerons (flaps on the wings that move in opposing directions) produce roll. On a spacecraft, the movements are usually produced by a reaction control system consisting of small rocket thrusters used to apply asymmetrical thrust on the vehicle. Normally, these axes are represented by

1368-563: The waterline. The terms prow and "bow" are often used interchangeably to describe the most forward part of a ship and its surrounding parts. Pitch (aviation) An aircraft in flight is free to rotate in three dimensions: yaw , nose left or right about an axis running up and down; pitch , nose up or down about an axis running from wing to wing; and roll , rotation about an axis running from nose to tail. The axes are alternatively designated as vertical , lateral (or transverse ), and longitudinal respectively. These axes move with

1406-464: The way; right long line by continual work without negligence of slothful tarrying. In Lucy is said, the way of light. Etymology in the modern sense emerged in the late 18th-century European academia, within the context of the wider " Age of Enlightenment ", although preceded by 17th century pioneers such as Marcus Zuerius van Boxhorn , Gerardus Vossius , Stephen Skinner , Elisha Coles , and William Wotton . The first known systematic attempt to prove

1444-691: The words of the sacred Vedas contained deep encoding of the mysteries of the soul and God. One of the earliest philosophical texts of the Classical Greek period to address etymology was the Socratic dialogue Cratylus ( c.  360 BCE ) by Plato . During much of the dialogue, Socrates makes guesses as to the origins of many words, including the names of the gods. In his Odes Pindar spins complimentary etymologies to flatter his patrons. Plutarch ( Life of Numa Pompilius ) spins an etymology for pontifex , while explicitly dismissing

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