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(countable, zootomy) A hard growth of keratin that protrudes from the top of the head of certain animals, usually paired.
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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.
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An antler.
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(uncountable) The hard substance from which animals' horns are made, sometimes used by man as a material for making various objects.
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A vessel made from a horn, to contain drink, ink, gunpowder, etc.
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An object whose shape resembles a horn, such as cornucopia or the point of an anvil.
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(countable) Any of several musical wind instruments.
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(countable, music) An instrument resembling a musical horn and used to signal others.
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(countable, automotive) A loud alarm, especially one on a motor vehicle.
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(chiefly sports) A sound signaling the expiration of time.
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(countable) A conical device used to direct waves.
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(informal, music, countable) Generally, any brass wind instrument.
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(slang, countable) A telephone.
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(vulgar, slang, with definite article) An erection of the penis.
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(countable, geography) A peninsula or projecting tract of land.
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(countable) 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.
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(botany) An incurved, tapering and pointed appendage found in the flowers of the milkweed (Asclepias).
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(military) 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.