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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 as·cid·i·an /əˈsɪdiən/

From: Webster's Revised Unabridged Dictionary (1913)

 As·cid·i·an n.  Zool. One of the Ascidioidea, or in a more general sense, one of the Tunicata. Also as an adj.

From: WordNet (r) 2.0

      n : minute sedentary marine invertebrate having a saclike body
          with siphons through which water enters and leaves