antler (n.)youdaoicibaDictYouDict
late 14c., from Anglo-French auntiler, Old French antoillier (14c., Modern French andouiller) "antler," perhaps from Gallo-Roman cornu *antoculare "horn in front of the eyes," from Latin ante "before" (see ante) + ocularis "of the eyes" (see ocular). This etymology is doubted by some because no similar word exists in any other Romance language, but compare German Augensprossen "antlers," literally "eye-sprouts," for a similar formation.
hartshorn (n.)youdaoicibaDictYouDict
"ammonium carbonate," Old English heortes hornes, from hart + horn (n.). So called because a main early source of ammonia was the antlers of harts.
rack (n.1)youdaoicibaDictYouDict
"frame with bars," c. 1300, possibly from Middle Dutch rec "framework," literally "something stretched out, related to recken (modern rekken) "stretch out," cognate with Old English reccan "to stretch out," from Proto-Germanic *rak- (cognates: Old Saxon rekkian, Old Frisian reza, Old Norse rekja, Old High German recchen, German recken, Gothic uf-rakjan "to stretch out"), from PIE *rog-, from root *reg- "to move in a straight line" (see regal).

Meaning "instrument of torture" first recorded early 15c., perhaps from German rackbank, originally an implement for stretching leather, etc. Mechanical meaning "toothed bar" is from 1797 (see pinion). Meaning "set of antlers" is first attested 1945, American English; hence slang sense of "a woman's breasts" (especially if large), by 1991. Meaning "framework for displaying clothes" is from 1948; hence off the rack (1951) of clothing, as opposed to tailored.
muntjacyoudaoicibaDictYouDict
"A small SE Asian deer, the male of which has tusks, small antlers, and a doglike bark", Late 18th century: from Sundanese minchek.