| horn | (noun) one of the bony outgrowths on the heads of certain ungulates | - |
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| (noun) any hard protuberance from the head of an organism that is similar to or suggestive of a horn | - |
| (noun) a brass musical instrument consisting of a conical tube that is coiled into a spiral and played by means of valves | Synonyms: French horn |
| (noun) a brass musical instrument with a brilliant tone; has a narrow tube and a flared bell and is played by means of valves | Synonyms: cornet, trump, trumpet |
| (noun) an alarm device that makes a loud warning sound | - |
| (noun) a high pommel of a Western saddle (usually metal covered with leather) | Synonyms: saddle horn |
| (noun) a device on an automobile for making a warning noise | Synonyms: automobile horn, car horn, hooter, motor horn |
| (noun) a noisemaker (as at parties or games) that makes a loud noise when you blow through it | - |
| (noun) a device having the shape of a horn | - |
| (noun) a noise made by the driver of an automobile to give warning | - |
| (noun) the material (mostly keratin) that covers the horns of ungulates and forms hooves and claws and nails | - |
| hornbeam | (noun) any of several trees or shrubs of the genus Carpinus | - |
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| hornbill | (noun) bird of tropical Africa and Asia having a very large bill surmounted by a bony protuberance; related to kingfishers | - |
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| hornblende | (noun) a green to black mineral of the amphibole group; consists of silicates of calcium and sodium and magnesium and iron | - |
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| hornbook | (noun) a primer that provides instruction in the rudiments or basic skills of a branch of knowledge | - |
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| hornet | (noun) large stinging paper wasp | - |
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| hornfels | (noun) a fine-grained metamorphic rock formed by the action of heat on clay rocks | Synonyms: hornstone |
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| horniness | (noun) a state of sexual arousal | Synonyms: hot pants, hotness |
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| hornist | (noun) a musician who plays a horn (especially a French horn) | - |
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| hornpipe | (noun) a British solo dance performed by sailors | - |
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| (noun) an ancient (now obsolete) single-reed woodwind; usually made of bone | Synonyms: pibgorn, stockhorn |
| (noun) music for dancing the hornpipe | - |
| hornpout | (noun) catfish common in eastern United States | Synonyms: Ameiurus Melas, horned pout, pout |
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| hornstone | (noun) a fine-grained metamorphic rock formed by the action of heat on clay rocks | Synonyms: hornfels |
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| hornwork | (noun) an element of the trace italienne system of fortification that consists of a pair of demi-bastions. | - |
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| hornwort | (noun) liverworts with slender hornlike capsules | - |
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| (noun) any aquatic plant of the genus Ceratophyllum; forms submerged masses in ponds and slow-flowing streams | - |