A hard growth of keratin that protrudes from the top of the head of certain animals, usually paired. • Any similar real or imaginary growth or projection such as the elongated tusk of a narwhal, the eyestalk of a snail, the pointed growth on the nose of a rhinoceros, or the hornlike projection on the head of a demon or similar. • An antler. • The hard substance from which animals' horns are made, sometimes used by man as a material for making various objects. • A vessel made from a horn, to contain drink, ink, gunpowder, etc. • An object whose shape resembles a horn, such as cornucopia or the point of an anvil. • One of the two corners of a crescent, particularly of the crescent moon • The high pommel of a saddle; also, either of the projections on a lady's saddle for supporting the leg. • The Ionic volute. • The outer end of a crosstree; also, one of the projections forming the jaws of a gaff, boom, etc. • A curved projection on the fore part of a plane. • One of the projections at the four corners of the Jewish altar of burnt offering. • Any of several musical wind instruments. • An instrument resembling a musical horn and used to signal others. • A loud alarm, especially one on a motor vehicle. • A sound signaling the expiration of time. • A conical device used to direct waves. • Generally, any brass wind instrument. • A telephone. • An erection of the penis. • A peninsula or projecting tract of land. • A diacritical mark that may be attached to the top right corner of the letters o and u when writing in Vietnamese, thus forming ơ and ư. • An incurved, tapering and pointed appendage found in the flowers of the milkweed (Asclepias). • In naval mine warfare, a projection from the mine shell of some contact mines which, when broken or bent by contact, causes the mine to fire.