Abranchiata

1 definition found

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

  Abranchiata \A*bran`chi*a"ta\, n. pl. [NL., from Gr. 'a priv. +
     ?, pl., the gills of fishes.] (Zool.)
     A group of annelids, so called because the species composing
     it have no special organs of respiration.
     [1913 Webster]