Search Result for "ascidian": 
Wordnet 3.0

NOUN (1)

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



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]


WordNet (r) 3.0 (2006):

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