Cit″ron (sĭt″rŭn), n. [F. citron, LL. citro, fr. L. citrus citron tree (cf. citreum, sc. malum, a citron), from Gr. κίτρον citron] 1. (Bot) A fruit resembling a lemon, but larger, and pleasantly aromatic. The thick rind, when candied, is the citron of commerce.
2. A citron tree.
3. A citron melon.
Citron melon. (a) A small variety of muskmelon with sugary greenish flesh. (b) A small variety of watermelon, whose solid white flesh is used in making sweetmeats and preserves. — Citron tree(Bot.), the tree which bears citrons. It was probably a native of northern India, and is now understood to be the typical form of Citrus Medica.