*ascidium*

‖n.; pl. Ascidia [ NL., fr. ascus. See Ascus. ] 1. (Bot.) A pitcher-shaped, or flask-shaped, organ or appendage of a plant, as the leaves of the pitcher plant, or the little bladderlike traps of the bladderwort (Utricularia). [ 1913 Webster ]

2. pl. (Zool.) A genus of simple ascidians, which formerly included most of the known species. It is sometimes used as a name for the Ascidioidea, or for all the Tunicata. [ 1913 Webster ]