Etymology
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tachyon (n.)

1967, hypothetical faster-than-light particle, from tachy- "swift" + -on.

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astern (adv.)

"toward the hinder part of a ship," 1620s, from a- (1) "on" + stern (n.).

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defibrillator (n.)

by 1953, an agent-noun form probably based on defibrillation.

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farcical (adj.)

1716, from farce + -ical, perhaps on the model of comical. Related: Farcically.

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hideosity (n.)

"a very ugly thing," 1807, from hideous on model of monstrosity, etc.

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cuff (v.1)

"to put a cuff on," 1690s, from cuff (n.). Related: Cuffed; cuffing.

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estuarine (adj.)

1835, from estuary on model of marine (adj.); see -ine (1).

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unless (conj.)

mid-15c., earlier onlesse, from (not) on lesse (than) "(not) on a less compelling condition (than);" see less. The first syllable originally was on, but the quality of negation in the word and the lack of stress changed it to un-. "Except could once be used as a synonym for unless, but the words have now drawn entirely apart" [Century Dictionary].

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greet (v.)

Old English gretan "to come in contact with" in any sense ("attack, accost" as well as "salute, welcome," and "touch, take hold of, handle," as in hearpan gretan "to play the harp"), "seek out, approach," from West Germanic *grotjan (source also of Old Saxon grotian, Old Frisian greta, Dutch groeten, Old High German gruozen, German grüßen "to salute, greet"), of uncertain origin.

In English, German, and Dutch, the primary sense has become "to salute," but the word once had much broader meaning. Perhaps originally "to resound" (via notion of "cause to speak"), causative of Proto-Germanic *grætanan, root of Old English grætan (Anglian gretan) "weep, bewail," from PIE *gher- (2) "to call out." Greet still can mean "cry, weep" in Scottish & northern England dialect, though this might be from a different root. Grætan probably also is the source of the second element in regret. Related: Greeted; greeting.

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noodle (v.)

"improvise or play casually on a musical instrument," 1937 (implied in noodling), from noun meaning "improvised music," 1926, perhaps from noodle (n.), on analogy of the suppleness of the food and that of the trills and improvised phrases in jazz improvisations. Related: Noodled.

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