Definition of "Horn" :

noun: one of the bony outgrowths on the heads of certain ungulates

noun: any hard protuberance from the head of an organism that is similar to or suggestive of a horn

noun: a device on an automobile for making a warning noise

noun: a brass musical instrument with a brilliant tone; has a narrow tube and a flared bell and is played by means of valves

noun: a brass musical instrument consisting of a conical tube that is coiled into a spiral and played by means of valves

noun: an alarm device that makes a loud warning sound

noun: a high pommel of a Western saddle (usually metal covered with leather)

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

"Horns at the ends of a new moon."

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

verb: stab or pierce with a horn or tusk

"The rhino horned the explorer."