||Hy`os*cy"a*mus (?), n. [L., fr. Gr. ?; ? a sow, hog + ? a bean.] 1. (Bot.) A genus of poisonous plants of the Nightshade family; henbane.
2. (Med.) The leaves of the black henbane (Hyoscyamus niger), used in neuralgic and pectorial troubles.