Ascidian

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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) 2.0 [wn]:



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