As*cid"i*um (#), 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).
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.
© Webster 1913.