\Or"i*gan\, Origanum \O*rig"a*num\, n. [L. origanum, Gr. ?, ?, prob. fr. 'o`ros, mountain + ? brightness, beauty. Cf. {Organy}.] (Bot.) A genus of aromatic labiate plants, including the sweet marjoram ({O. Marjorana}) and the wild marjoram ({O. vulgare}). --Spenser.