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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Ascidium  \As*cid"i*um\  ([a^]s*s[i^]d"[i^]*[u^]m),  n.;  pl 
  {Ascidia}  (-[.a]).  [NL.,  fr  ascus.  See  {Ascus}.] 
  1.  (Bot.)  A  pitcher-shaped,  or  flask-shaped,  organ  or 
  appendage  of  a  plant,  as  the  leaves  of  the  pitcher  plant, 
  or  the  little  bladderlike  traps  of  the  bladderwort 
  2.  pl  (Zo["o]l.)  A  genus  of  simple  ascidians,  which  formerly 
  included  most  of  the  known  species.  It  is  sometimes  used 
  as  a  name  for  the  Ascidioidea,  or  for  all  the  Tunicata.