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Cnidaria

[nahy-dair-ee-uh] /naɪˈdɛər i ə/
noun, Zoology
1.
an alternative name for the invertebrate phylum Coelenterata, giving emphasis to the stinging structures as characteristic of the phylum.
Origin of Cnidaria
< New Latin; see cnida, -aria
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Origin and History for Cnidaria
n.

phylum of stinging invertebrates, from Modern Latin cnida, from Greek knide "nettle," from stem of knizein "to scratch scrape." Related: Cnidarian.

Online Etymology Dictionary, © 2010 Douglas Harper
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