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English definition of “horn”

horn

noun uk   /hɔːn/ us    /hɔːrn/

horn noun (ANIMAL)

C1 [C or U] a hard, pointed, often curved part that grows from the top of the head of some animals, or the hard substance of which a horn is made

horn noun (VEHICLE)

B2 [C] a device on a vehicle that is used to make a loud noise as a warning or signal to other people: The driver blew/sounded (informal honked) her horn.
See also

horn noun (MUSIC)

C2 [C] a curved metal musical instrument that is narrow at the end you blow into and much wider at the other end
(Definition of horn from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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