Etymology
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stirrup (n.)

Old English stigrap "a support for the foot of a person mounted on a horse," literally "climbing rope," from stige "a climbing, ascent" (from Proto-Germanic *stigaz "climbing;" see stair) + rap (see rope (n.)). Originally a looped rope as a help for mounting. Germanic cognates include Old Norse stigreip, Middle Dutch stegerep, Old High German stegareif, German stegreif. Surgical device used in childbirth, etc., so called from 1884. Stirrup-cup (1680s) was a cup of wine or other drink handed to a rider already on horseback and setting out on a journey, hence "a parting glass" (compare French le vin de l'etrier).

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snifter (n.)

1844, "a small drink of liquor, a 'nip,' " from a Scottish and northern English survival of an obsolete verb snifter "to sniffle," frequentative of snift "to sniff, snivel" (mid-14c., snifter), ultimately of imitative origin (compare sniff (v.)), but perhaps to English via a Scandinavian source (compare Old Danish snifte, Swedish snyfta).

The meaning "large bulbous stemmed glass for drinking brandy" is attested from 1937. The association of "drinking liquor" with words for "inhaling, snuffling" (such as snort (n.), snootful) is perhaps from snuff-taking and the nasal reaction to it. In Scottish and Northern England dialect snifter (n.) also had various senses, such as "a strong wind," "a bad head-cold," "snuff."

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flute (n.)

early 14c., from Old French flaut, flaute (musical) "flute" (12c.), from Old Provençal flaut, which is of uncertain origin; perhaps imitative or from Latin flare "to blow" (from PIE root *bhle- "to blow"); perhaps influenced by Provençal laut "lute." The other Germanic words (such as German flöte) are likewise borrowings from French.

Ancient flutes were direct, blown straight through a mouthpiece but held away from the player's mouth; the modern transverse or German flute developed 18c. The older style then sometimes were called flûte-a-bec (French, literally "flute with a beak"). The modern design and key system of the concert flute were perfected 1834 by Theobald Boehm. The architectural sense of "furrow in a pillar" (1650s) is from fancied resemblance to the inside of a flute split down the middle. Meaning "tall, slender wine glass" is from 1640s.

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hat trick (n.)

in the sports sense, 1879, originally in cricket, "taking three wickets on three consecutive deliveries;" extended to other sports c. 1909, especially ice hockey ("In an earlier contest we had handed Army a 6-2 defeat at West Point as Billy Sloane performed hockey's spectacular 'hat trick' by scoring three goals" ["Princeton Alumni Weekly," Feb. 10, 1941]). So called allegedly because it entitled the bowler to receive a hat from his club commemorating the feat (or entitled him to pass the hat for a cash collection), but the term probably has been influenced by the image of a conjurer pulling objects from his hat (an act attested by 1876). The term was used earlier for a different sort of magic trick:

Place a glass of liquor on the table, put a hat over it, and say, "I will engage to drink every drop of that liquor, and yet I'll not touch the hat." You then get under the table; and after giving three knocks, you make a noise with your mouth, as if you were swallowing the liquor. Then, getting from under the table, say "Now, gentlemen, be pleased to look." Some one, eager to see if you have drunk the liquor, will raise the hat; when you instantly take the glass and swallow the contents, saying, "Gentlemen I have fulfilled my promise: you are all witnesses that I did not touch the hat." ["Wit and Wisdom," London, 1860]
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frame (n.)

c. 1200, "profit, benefit, advancement;" mid-13c. "a structure composed according to a plan," from frame (v.) and in part from Scandinavian cognates (Old Norse frami "advancement"). In late 14c. it also meant "the rack."

Meaning "sustaining parts of a structure fitted together" is from c. 1400. Meaning "enclosing border" of any kind is from c. 1600; specifically "border or case for a picture or pane of glass" from 1660s. The meaning "human body" is from 1590s. Of bicycles, from 1871; of motor cars, from 1900. Meaning "separate picture in a series from a film" is from 1916. From 1660s in the meaning "particular state" (as in Frame of mind, 1711). Frame of reference is 1897, from mechanics and graphing; the figurative sense is attested from 1924.

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orchard (n.)

late Old English orceard "fruit garden; piece of ground, usually enclosed, devoted to the culture of fruit-trees," also for meeting, recreation, etc., earlier ortgeard, perhaps reduced from wortgeard, from wort (Old English wyrt "vegetable, plant root") + geard "garden, yard" (also "vegetable garden" until 15c.); see yard (n.1). The first element would have been influenced in Middle English by Latin hortus (in Late Latin ortus) "garden," which also is from the PIE root (*gher- (1) "to grasp, enclose") that yielded yard (n.1). Orchard-house "glass house for the cultivation of fruits too delicate to be grown in open air" is by 1850.

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calash (n.)

"light carriage with low wheels either open or covered with a folding top," 1660s, from French calèche, from German kalesche, from Czech koleska, diminutive of kolesa "wheel-carriage," from kolo "wheel" (from PIE root *kwel- (1) "revolve, move round"). Also the name of the folding hood or top fitted to it (1856).

The Caleche is of French origin; a carriage with leather top, and portable glass shutters on the sides, and a panelled front, with sliding window. The whole front may be removed in a few minutes, making it an elegant open Barouche, with a half-top over the back seat. [Henry William Herbert ("Frank Forester"), "Hints to Horse-Keepers," New York, 1859]
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*wel- (3)

Proto-Indo-European root meaning "to turn, revolve," with derivatives referring to curved, enclosing objects.

It forms all or part of: archivolt; circumvolve; convoluted; convolution; devolve; elytra; evolution; evolve; Helicon; helicopter; helix; helminth; lorimer; ileus; involve; revolt; revolution; revolve; valve; vault (v.1) "jump or leap over;" vault (n.1) "arched roof or ceiling;" volte-face; voluble; volume; voluminous; volute; volvox; volvulus; vulva; wale; walk; wallet; wallow; waltz; well (v.) "to spring, rise, gush;" welter; whelk; willow.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit valate "turns round," ulvam "womb, vulva;" Lithuanian valtis "twine, net," vilnis "wave," apvalus "round;" Old Church Slavonic valiti "roll, welter," vlŭna "wave;" Greek eluein "to roll round, wind, enwrap," eilein "twist, turn, squeeze; revolve, rotate," helix "spiral object;" Latin volvere "to turn, twist;" Gothic walwjan "to roll;" Old English wealwian "roll," weoloc "whelk, spiral-shelled mollusk;" Old High German walzan "to roll, waltz;" Old Irish fulumain "rolling;" Welsh olwyn "wheel."

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vacuum (n.)

1540s, "emptiness of space," from Latin vacuum "an empty space, vacant place, a void," noun use of neuter of vacuus "empty, unoccupied, devoid of," figuratively "free, unoccupied," from Proto-Italic *wakowos, related to the source of Latin  vacare "to be empty" (from PIE *wak-, extended form of root *eue- "to leave, abandon, give out"), with adjectival suffix -uus. Properly a loan-translation of Greek kenon, literally "that which is empty."

Meaning "a space emptied of air" is attested from 1650s. Vacuum tube "glass thermionic device" is attested from 1859. Vacuum cleaner is from 1903; shortened form vacuum (n.) first recorded 1910.

The metaphysicians of Elea, Parmenides and Melissus, started the notion that a vacuum was impossible, and this became a favorite doctrine with Aristotle. All the scholastics upheld the maxim that "nature abhors a vacuum." [Century Dictionary]
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cobalt (n.)

1680s as the name of a type of steel-gray metal, from German kobold "household goblin" (13c.), which became also a Harz Mountains silver miners' term for rock laced with arsenic and sulfur (according to OED so called because it degraded the ore and made the miners ill), from Middle High German kobe "hut, shed" + *holt "goblin," from hold "gracious, friendly," a euphemistic word for a troublesome being.

The metallic element (closely resembling nickel but much rarer) was extracted from this rock. It was known to Paracelsus, but discovery is usually credited to the Swede George Brandt (1733), who gave it the name. Extended to a blue color 1835 (a mineral containing it had been used as a blue coloring for glass since 16c.). Compare nickel. Related: Cobaltic; cobaltous.

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