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Webster 1913 Edition
Cnidaria
‖
Cni-da′ri-a
(nĭ-dā′rĭ-ȧ)
, Noun.
pl.
[NL. See
Cnida
.] (Zool.)
A comprehensive group equivalent to the true Cœlenterata, i. e., exclusive of the sponges. They are so named from presence of stinging cells (
cnidae
) in the tissues. See Coelenterata
.