Definify.com
Webster 1913 Edition
Radiata
‖
Raˊdi-a′ta
(rā′dĭ-ā′tȧ)
, Noun.
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.
☞ It includes the cœlenterates 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.