"lustful, sexually aroused," definitely in use 1889, perhaps attested as early as 1863; from late 18c. slang expression to have the horn, suggestive of male sexual excitement (but eventually applied to women as well); see horn (n.).
例文
1. This cuttlefish has a horny internal shell like a pen.
このイカはペン状の角質内殻を持っている。
2.His fingernails had grown long,and horny .
彼の手の爪は長くて硬い。
3.the bird 's horny beak
鳥のクチバシ
4.Nails are thin horny growths at the ends of the fingers.