\As*cid"i*um\ ([a^]s*s[i^]d"[i^]*[u^]m), n.; pl.
{Ascidia} (-[.a]). [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. (Zo["o]l.) 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.