Etymology
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Words related to horn

horny (adj.)
late 14c., "made of horn," from horn (n.) + -y (2). From 1690s as "callous, resembling horn." The colloquial meaning "lustful, sexually aroused," was in use certainly by 1889, perhaps as early as 1863; it probably derives from the late 18c. slang expression to have the horn, suggestive of male sexual excitement (but eventually applied to women as well); see horn (n.). As a noun it once also was a popular name for a domestic cow. For an adjective in the original sense of the word, hornish (1630s) and horn-like (1570s) are available.
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inkhorn (n.)
late 14c., "small portable vessel (originally made of horn) for holding ink," from ink (n.) + horn (n.). Used attributively from 1540s ("Soche are your Ynkehorne termes," John Bale) as an adjective for things (especially vocabulary) supposed to be beloved by scribblers, pedants, and bookworms. An Old English word for the thing was blæchorn.
krummhorn (n.)
also crummhorn, "A medieval musical instrument of the clarinet class, having a curved tube and a melancholy sound" [Century Dictionary], 1864, from German, literally "crooked horn," from krumm "curved, crooked" (8c.), from a West Germanic *krumba- (compare Old English crumb, crump "crooked, bent, stooped," source of crumple); for second element see horn (n.).
longhorn (adj.)
also long-horn, in reference to a type of cattle, 1808, from long (adj.) + horn (n.).
Matterhorn 

Alpine mountain, from German Matte "meadow, pastureland" (see mead (n.2)) + Horn (see horn (n.)). So called for its horn-like shape (cut by glaciers in the Ice Ages). The slopes are steep and treacherous; the Matte is for the meadows at its base. The Roman name was Mons Silvius, which might be based on a personal name.

powder-horn (n.)

"powder flask made of horn (usually of an ox or cow) with a movable stopper at the small end," 1530s, from powder (n.) + horn (n.). 

reciprocornous (adj.)

"having horns turning backward and then forward," as a ram, 1775, with -ous + Latin reciprocornis, from reciprocus "turning back the same way" (see reciprocal) + cornu "horn" (see horn (n.)). "This form is characteristic of the sheep tribe, though not peculiar to it" [Century Dictionary].

scorn (n.)
c. 1200, a shortening of Old French escarn "mockery, derision, contempt," a common Romanic word (Spanish escarnio, Italian scherno) of Germanic origin, from Proto-Germanic *skarnjan "mock, deride" (source also of Old High German skern "mockery, jest, sport," Middle High German scherzen "to jump with joy").

Probably influenced by Old French escorne "affront, disgrace," which is a back-formation from escorner, literally "to break off (someone's) horns," from Vulgar Latin *excornare (source of Italian scornare "treat with contempt"), from Latin ex- "without" (see ex-) + cornu "horn" (see horn (n.)).
shoehorn (n.)
1580s, from shoe (n.) + horn (n.); earlier shoeing-horn (mid-15c.).
stinkhorn (n.)
type of foul-smelling fungus, 1724, from stink + horn (n.), for its shape.

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