horn

(countable) 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 umbrella with a handle made of horn

(uncountable) The hard substance from which animals' horns are made, sometimes used by man as a material for making various objects.

horns of mead and ale

1775, William Mason, The Poems of Mr. Gray. To which are prefixed Memoirs of his Life and Writings by W. Mason.:

I guarantee you a mighty feast, horns of ale, and afterwards wrestling and racing and contests of strength.

2017, Neil Gaiman, Norse Mythology, Bloomsbury Publishing, page 143:

A vessel made from a horn, to contain drink, ink, gunpowder, etc.

[W]hile riſing ſlow, / Blank, in the leaden-colour'd eaſt, the moon / Wears a wan circle round her blunted horns.

a. 1749 (date written), James Thomson, “Winter”, in The Seasons, London: […] A[ndrew] Millar, and sold by Thomas Cadell, […], published 1768, →OCLC, page 169, lines 123–125:

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.

(nautical) The outer end of a crosstree; also, one of the projections forming the jaws of a gaff, boom, etc.

(carpentry) A curved projection on the fore part of a plane.

Joab […] caught hold on the horns of the altar

1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC, 1 Kings 2:28:

One of the projections at the four corners of the Jewish altar of burnt offering.

(countable) Any of several musical wind instruments.

hunting horn

(countable, music) An instrument resembling a musical horn and used to signal others.

(countable, automotive) A loud alarm, especially one on a motor vehicle.

The shot was after the horn and therefore did not count.

(chiefly sports) A sound signaling the expiration of time.

antenna horn

loudspeaker horn

(countable) A conical device used to direct waves.

(informal, music, countable) Generally, any brass wind instrument.

Get him on the horn so that we can have a discussion about this.

(vulgar, slang, with definite article) An erection of the penis.

to navigate around the horn

But nowhere are there queerer waters than in our own parish of Caulds, at the place called the Sker Bay, where between two horns of land a shallow estuary receives the stream of the Sker.

1902, John Buchan, The Outgoing of the Tide:

(countable, geography) A peninsula or projecting tract of land.

(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.

(botany) An incurved, tapering and pointed appendage found in the flowers of the milkweed (Asclepias).

(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.

en-noun

horn (countable and uncountable, plural horns)

ܩܪܢܐ

any similar real or imaginary projection

toeter

loud alarm, especially on a motor vehicle

рог

informal: generally, any brass wind instrument

horn

peninsula or crescent-shaped tract of land

From Middle English horn, horne, from Old English horn, from Proto-West Germanic *horn, from Proto-Germanic *hurną. Compare West Frisian hoarn, Dutch hoorn, Low German Hoorn, horn, German Horn, Danish and Swedish horn, Gothic 𐌷𐌰𐌿𐍂𐌽 (haurn).
Ultimately from Proto-Indo-European *ḱr̥h₂-nó-m, from *ḱerh₂- (“head, horn”). Compare Breton kern (“horn”), Latin cornū, Ancient Greek κέρας (kéras), Proto-Slavic *sьrna, Old Church Slavonic сьрна (sĭrna, “roedeer”), Hittite [script needed] (surna, “horn”), Persian سر (sar), Sanskrit शृङ्ग (śṛṅga, “horn”).
(telephone): From the horn-shaped earpieces of old communication systems that used air tubes.


horn

(transitive, of an animal) To assault with the horns.

(transitive, slang, obsolete) To cuckold.

Rabia Sajal Niazi, His Precious Gem
He horned five times but the man didn't moved his car away.

(intransitive, Singapore, India) To sound the horn of a motor vehicle; to honk.

en-verb

horn (third-person singular simple present horns, present participle horning, simple past and past participle horned)

horns (present singular third-person)
horning (participle present)
horned (participle past)
horned (past)