n. [ See Hyoscyamus. ] (Chem.) An alkaloid found with hyoscyamine (with which it is also isomeric) in henbane, and extracted as a white, amorphous, semisolid substance. [ 1913 Webster ]
a. (Zool.) Relating to the Oscines. [ 1913 Webster ]
‖n. pl. [ L. oscen, -inis. ] (Zool.) Singing birds; a group of the Passeres, having numerous syringeal muscles, conferring musical ability. [ 1913 Webster ]