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2 definitions found
 for Ascidian
From The Collaborative International Dictionary of English v.0.48 :

  Ascidian \As*cid"i*an\, n. [Gr. ? bladder, pouch.] (Zool.)
     One of the Ascidioidea, or in a more general sense, one of
     the Tunicata. Also as an adj.
     [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: minute sedentary marine invertebrate having a saclike body
           with siphons through which water enters and leaves

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