Radiata

1 definition found

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

  Radiata \Ra`di*a"ta\ (r[=a]"d[i^]*[=a]"t[.a]), n. pl. [NL., fr.
     radiatus, p. p. See {Radiate}.] (Zool.)
     An extensive artificial group of invertebrates, having all
     the parts arranged radially around the vertical axis of the
     body, and the various organs repeated symmetrically in each
     ray or spheromere.


     [1913 Webster]
  
     Note: It includes the c[oe]lenterates and the echinoderms.
           Formerly, the group was supposed to be a natural one,
           and was considered one of the grand divisions of the
           animal kingdom.
           [1913 Webster]