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From The Collaborative International Dictionary of English v.0.48:
Ascidium \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). [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]