Cro"ton (kr?"t?n), n. [Gr. &?;&?;&?;&?;, prop., a tick, which the seed of the croton resembles.] (Bot.) A genus of euphorbiaceous plants belonging to tropical countries.

Croton oil(Med.), a viscid, acrid, brownish yellow oil obtained from the seeds of Croton Tiglium, a small tree of the East Indies. It is a most powerful drastic cathartic, and is used externally as a pustulant.