Etymology
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claw (n.)

"sharp, hooked, horny end of the limb of a mammal, bird, reptile, etc.," Old English clawu, earlier clea, "claw, talon, iron hook," from Proto-Germanic *klawo (source also of Old Frisian klawe "claw, hoe," Middle Dutch klouwe, Dutch klauw, Old High German klawa, German Klaue "claw").

Claw-foot in reference to carved furniture legs is from 1823; claw-and-ball attested from 1893. Claw-hammer, one having one end divided into two claws, is attested from 1769.

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chelicerae (n.)

piercing appendages in the proboscis of scorpions and spiders, 1831, plural of Modern Latin chelicera, from Greek khēlē "crab claw, talon, pincers; cloven hoof of cattle, horse's hoof," metaphorically "surgical forceps, hooked needle, crochet needle, notch of an arrow," a word of uncertain origin with no agreement on ulterior connections (according to Watkins, related to keras "horn," from PIE root *ker- (1) "horn; head"). Earlier chelicer (1835), from French chélicère.

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crotch (n.)

1530s, "pitchfork," from Old North French croche "shepherd's crook," variant of croc "hook," from Old Norse krokr "hook," which is of obscure origin but perhaps related to the widespread group of Germanic kr- words meaning "bent, hooked."

From 1570s as "any fork or forking," especially "a parting of branches of a tree;" meaning "region where the body forks" is attested from 1590s. Hence crotchcutter "women's bathing suit with leg openings which reach above the hips" (by 1997).

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Velcro (n.)

1958, proprietary name (Britain), from French vel(ours) cro(ché) "hooked velvet."

Here is a nonmetallic fastener with no mechanical parts. It is simply two strips of nylon, one woven with thousands of tiny protruding hooks, the other with loops. Pressed together, they catch like a burr to clothing, can't be parted except by peeling. American Velcro, Manchester, N.H., makes them to hold anything from pants to upholstery. [Popular Science, December 1958]
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hockey (n.)

ball game played with a curved stick or club, 1527, implied in a document from Ireland ("The horlinge of the litill balle with hockie stickes or staves ..."), of unknown origin. Perhaps related to French hoquet "shepherd's staff, crook," diminutive of Old French hoc "hook." The hooked clubs with which the game is played resemble shepherds' staves. In North America, ice hockey is distinguished from field hockey, but hockey alone can mean either. Also known as shinny or shinty.

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bill (n.3)
ancient weapon, Old English bill "sword (especially one with a hooked blade), chopping tool," from Proto-Germanic *bili-, a word for cutting or chopping weapons (compare Old Saxon bil "sword," Middle Dutch bile, Dutch bijl, Old High German bihal, German Beil, Old Norse bilda "hatchet"), possibly from PIE root *bheie- "to cut, to strike" (source also of Armenian bir "cudgel," Greek phitos "block of wood," Old Church Slavonic biti "to strike," Old Irish biail "ax").
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mordant (adj.)

late 15c., "caustic, biting, severe" (of words, speech), from Old French mordant, literally "biting," present participle of mordre "to bite," from Latin mordēre "to bite, bite into; nip, sting;" figuratively "to pain, cause hurt," which is perhaps from an extended form of PIE root *mer- "to rub away, harm." Related: Mordantly.

The noun is first attested in a now-obsolete or archaic sense of "ornamented hooked clasp of a belt or girdle" (mid-14c.), from Old French mordant in this sense. In dyeing, "substance used in fixing colors," it is attested by 1791; as an adjective in dyeing, "having the property of fixing colors," by 1902. Related: Mordancy; mordantly.

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kipper (n.)
Old English cypera "male salmon," perhaps related to coper "reddish-brown metal" (see copper (n.1)), on resemblance of color. Another theory connects it to kip (n.) "sharp, hooked lower jaw of the male salmon in breeding season," which is from Middle English kippen "to snatch, tug, pull," but OED doubts this.

The modern noun usually is a shortening of kippered herring, from a verb meaning "to cure a fish by cleaning, salting, and spicing it" (early 14c.). The earliest attested uses of the verb are to preparing salmon, hence the verb. The modern noun kipper is recorded from 1773 of salmon, 1863 of herring.
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grape (n.)
Origin and meaning of grape
mid-13c., "a grape, a berry of the vine," also collective singular, from Old French grape "bunch of grapes, grape" (12c.), probably a back-formation from graper "steal; grasp; catch with a hook; pick (grapes)," from a Frankish or other Germanic word, from Proto-Germanic *krappon "hook," from a group of Germanic words meaning "bent, crooked, hooked" (cognates: Middle Dutch crappe, Old High German krapfo "hook;" also see cramp (n.2)). The original notion thus perhaps was "vine hook for grape-picking." The vine is not native to England. The word replaced Old English winberige "wine berry." Spanish grapa, Italian grappa also are from Germanic.
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aquiline (adj.)
"curved like an eagle's beak," 1640s, originally in English in reference to long, hooked noses, from Latin aquilinus "of or like an eagle," from aquila "eagle," a word of uncertain origin, usually explained as "the dark bird;" compare aquilus "blackish, swarthy, of the color of darkness," but some suggest the color word is from the bird.

De Vaan writes, "It is possible that 'eagle' was derived from aquilus 'dark' when this had received its colour meaning. It may not be the only dark bird, but it is certainly one of the biggest and most majestic of them." As for aquilus, "The Romans derived this colour from aqua 'water', which [Etymologicum Magnum] reject because they cannot imagine water being black. Still, this seems a more likely derivation to me than from aquila 'eagle' ...."

Meaning "pertaining to an eagle" is from 1650s; that of "eagle-like" is by 1742.
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