Sabadilla \Sab`a*dil"la\ (s[a^]b`[.a]*d[i^]l"l[.a]), n. [Sp. cebadilla.] (Bot.) A Mexican liliaceous plant ({Sch[oe]nocaulon officinale}); also, its seeds, which contain the alkaloid veratrine. It was formerly used in medicine as an emetic and purgative.