Ascidium
Ascidium (as*sid"i*um) , noun
[New Latin, from ascus. See Ascus.]
1.
(Botany) 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.
(Zoology) 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.