1. A hard, projecting, and usually pointed organ, growing upon the heads of certain animals, especially. Of the ruminants, as cattle, goats, and the like. The hollow horns of the ox family consist externally of true horn, and are never shed.
3. (Science: zoology) Any natural projection or excrescence from an animal, resembling or thought to resemble a horn in substance or form; especially., a projection from the beak of a bird, as in the hornbill. A tuft of feathers on the head of a bird, as in the horned owl. A hornlike projection from the head or thorax of an insect, or the head of a reptile, or fish. A sharp spine in front of the fins of a fish, as in the horned pout.
5. Something made of a horn, or in resemblance of a horn; as: a wind instrument of music; originally, one made of a horn (of an ox or a ram); now applied to various elaborately wrought instruments of brass or other metal, resembling a horn in shape. Wind his horn under the castle wall. . See french horn.
8. The tough, fibrous material of which true horns are composed, being, in the ox family, chiefly albuminous, with some phosphate of lime; also, any similar substance, as that which forms the hoof crust of horses, sheep, and cattle; as, a spoon of horn.
10. An emblem of a cuckold; used chiefly in the plural. Thicker than a cuckold's horn. horn block, the frame or pedestal in which a railway car axle box slides up and down; also called horn plate. Horn of a dilemma. See Dilemma. Horn distemper, a disease of cattle, affecting the internal substance of the horn. Horn drum, a wheel with long curved scoops, for raising water.
Origin: as. Horn; akin to D. Horen, hoorn, g, Icel, Sw, & dan. Horn, goth. Haorn, W, gael, & ir. Corn, L. Cornu, gr, and perh. Also to E. Cheer, cranium, cerebral; cf. Skr. Ciras head. Cf. Carat, corn on the foot, cornea, Corner, Cornet, Cornucopia, hart.