Consisting or composed of horn, or something like horn; corneous.Resembling horn; hard or otherwise like horn; callous: as, horny hands.Specifically — In entomology, chitinous: used to designate any hard part of the integument or interior organs of an insect.In botany, hard and close in texture, but not brittle, as the albumen of many plants.In sponges, fibrous; ceratodous, as an ordinary sponge, as distinguished from a chalk-sponge or a glass-sponge.Having a horn or horns; having corns, callosities, or processes like horns.n. The devil, as usually represented with horns: generally with the prefix old (Scotch auld.) Also spelled Hornie.