Horn

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 antler.

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

"an umbrella with a handle made of horn"

(of an animal) To assault with the horns.

To furnish with horns.

To cuckold.