Dictionary![]() ![]() as•cid•i•anPronunciation: (u-sid'ē-un), [key] Zool. —n. any solitary or colonial tunicate of the class Ascidiacea, exhibiting in the larval stage the vertebrate characteristics of a notocord and hollow nerve cord. —adj. belonging or pertaining to the class Ascidiacea. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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