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TWA [TWA 词源字典]: formed May 16, 1928, as Transcontinental Air Transport, merged 1930 with Western Air Express to form Transcontinental and Western Air Inc. (TWA). Name changed to Trans World Airlines 1950, but the moniker remained the same. Its last remnants were bought out by rival American Airlines in April 2001.[TWA etymology, TWA origin, 英语词源]
twa (n.): Scottish form of two.
twaddle (n.): "silly talk, prosy nonsense," 1782, probably from twattle (1550s), of obscure origin.
twain: Old English twegen "two" (masc. nominative and accusative), from Proto-Germanic *twa- "two" (see two). It corresponds to Old Frisian twene, Dutch twee, Old High German zwene, Danish tvende. The word outlasted the breakdown of gender in Middle English and survived as a secondary form of two, especially in cases where the numeral follows a noun. Its continuation into modern times was aided by its use in KJV and the Marriage Service, in poetry (where it is a useful rhyme word), and in oral use where it is necessary to be clear that two and not to or too is meant. In U.S. nautical use as "a depth of two fathoms" from 1799.
twang (n.): 1550s, of imitative origin. Originally the sound of plucked bows and strings; extension to "a nasal vocal sound" is first recorded 1660s. The verb is first attested 1540s. Related: Twanged; twanging.
twangy (adj.): 1858, from twang (n.) + -y (2). Related: Twangily; twanginess.
twat (n.): female pudendum, 1650s, of unknown origin. A general term of abuse since 1920s.
The T-word occupies a special niche in literary history, however, thanks to a horrible mistake by Robert Browning, who included it in 'Pippa Passes' (1841) without knowing its true meaning. 'The owls and bats,/Cowls and twats,/Monks and nuns,/In a cloister's moods.' Poor Robert! He had been misled into thinking the word meant 'hat' by its appearance in 'Vanity of Vanities,' a poem of 1660, containing the treacherous lines: 'They'd talk't of his having a Cardinalls Hat,/They'd send him as soon an Old Nuns Twat.' (There is a lesson here about not using words unless one is very sure of their meaning.) [Hugh Rawson, "Wicked Words," 1989]
tweak (v.): "pinch, pluck, twist," usually to the nose, c. 1600, probably from Middle English twikken "to draw, tug, pluck" (mid-15c.), from Old English twiccian "to pluck," of obscure origin; perhaps related to twitch. Meaning "to make fine adjustments" is attested from 1966. Related: Tweaked; tweaking.
tweak (n.): c. 1600, "a twitch, a pluck," from tweak (v.). As "a fine adjustment" by 1989.
twee (adj.): "tiny, dainty, miniature," 1905, from childish pronunciation of sweet (adj.). Compare tummy from stomach.
tweed (n.): 1839, a trade name for a type of woolen fabric:
MICHAEL NOWAK, alias John Mazurkiewiez, was indicted for stealing on the 15th of April 2 ¼ yards of woollen cloth, called tweed, value 12s., and 2 ¼ yards of woollen cloth, called doe skin, value 17s., the goods of George Priestley Heap. [London Central Criminal Court minutes of evidence from 1839]
This apparently developed from the "Tweed Fishing or Travelling Trousers" advertised in numerous publications from 1834-1838 by the clothing house of Doudney & Son, 49 Lombard Street.
So celebrated has amateur rod-fishing in the Tweed become, that the proper costume of the sportsman has now become an object of speculation among the London tailors, one of whom advertises among other articles of dress "Tweed Fishing Trousers." The anglers who have so long established their head-quarters at Kelso, for the purpose of enjoying the amusement of salmon fishing in the Tweed, have had excellent sport lately : some of the most skilful having caught five or six salmon a day, weighing from six to fourteen pounds each. ["New Sporting Magazine," June 1837]
Thus ultimately named for the River Tweed in Scotland. The place name has not been explained, and it is perhaps pre-Celtic and non-Indo-European.
tweedledum (n.): paired with tweedledee to signify two things or persons nearly alike, differing in name, 1725, coined by English poet John Byrom (1692-1767) in his satire "On the Feud Between Handel and Bononcini," a couple of competing musicians, from tweedle "to sing, to whistle" (1680s), of imitative origin. The -dum and -dee perhaps suggest low and high sounds respectively.
tweedy (adj.): "characteristic of the country or suburban set," 1912, from tweed + -y (2). Related: Tweediness.
tween (prep.): also 'tween, c. 1300 as an abbreviation of between. As a noun meaning "child nearing puberty" (approximately ages 9 to 12), attested by 1988, in this case by influence of teen. Tolkien uses it in "Lord of the Rings" for "the irresponsible twenties between [Hobbit] childhood and coming of age at thirty-three." Earlier in this sense was subteen (1952). Related: Tweens. Tweenie or tweeny was a term (late 19c.-early 20c.) for "between-maid, a servant who assists two others" and was used in reference to other persons or objects in intermediary situations. And 'tween-age (adj.) was used in descriptions of clothing from 1937. Tween-ager is attested from 1946.
tweet (n.): 1845, imitative of the sound made by a small bird. As a verb by 1872. Related: Tweeted; tweeting. As the word for what one does on the Twitter microblogging service, by 2007.
tweeter (n.): "loudspeaker for high frequencies," 1934, agent noun from tweet (v.).
tweeze (v.): "to pluck with tweezers," 1921, back-formation from tweezers. Related: Tweezed; tweezing. Earlier verb was tweezer (1806).
tweezers (n.): "small pincers, diminutive tongs," 1650s, extended from tweezes, plural of tweeze "case for tweezers" (1620s), a shortening of etweese, considered as plural of etwee (1610s) "a small case," from French étui "small case" (see etui). Sense transferred from the case to the implement inside it. For form, compare trousers from trouzes.
twelfth (adj.): late 14c., with -th (1), altering Middle English twelfte, from Old English twelfta, from twelf ((see twelve). The earlier form is cognate with Old Norse tolfti, Danish tolvte, Old Frisian twelefta, Dutch twaalfde, Old High German zwelifto, German zwölfte .

As a noun meaning "a twelfth part," from 1550s. Twelfth Night is Old English twelftan niht "Twelfth Night," the eve of Epiphany, which comes twelve days after Christmas, formerly an occasion of social rites and a time of merrymaking.
twelve (adj.): Old English twelf "twelve," literally "two left" (over ten), from Proto-Germanic *twa-lif-, a compound of the root of two + *lif-, root of the verb leave (see eleven). Compare Old Saxon twelif, Old Norse tolf, Old Frisian twelef, Middle Dutch twalef, Dutch twaalf, Old High German zwelif, German zwölf, Gothic twalif. Outside Germanic, an analogous formation is Lithuanian dvylika, with second element -lika "left over."