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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]

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