Hypertext Webster Gateway: "ascidian"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Ascidian \As*cid"i*an\, n. [Gr. ? bladder, pouch.] (Zo["o]l.)
One of the Ascidioidea, or in a more general sense, one of
the Tunicata. Also as an adj.
From WordNet (r) 1.7 (wn)
ascidian
n : minute sedentary marine invertebrate having a saclike body
with siphons through which water enters and leaves
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