Horn

n. 1 a hard outgrowth, often curved and pointed, on the head of esp. hoofed animals. b each of two branched appendages on the head of (esp. male) deer. c hornlike projection on animals, e.g. a snail’s tentacle. 2 substance of which horns are made. 3 Mus. a = FRENCH HORN. b wind instrument played by lip vibration. orig. made of horn. now usu. of brass. 4 instrument sounding a warning. 5 receptacle or instrument made of horn. 6 hornshaped projection. 7 extremity of the moon or other crescent. 8 arm of a river etc. o horn in slang intrude, interfere.