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Latin word cornu comes from Proto-Indo-European *ḱerh₂-
*ḱerh₂- (Proto-Indo-European)
*ḱr̥h₂-no- (Proto-Indo-European)
cornu (Latin)
(figuratively) power, strength, might. (musical instruments) a horn as a musical instrument. A horn, antler. A tusk. An arm or wing of an army. Any substance like the material of a horn, such as the bill of a bird. The end of a book or scroll, usually made of ivory. The horns of the moon.