noun Zoology.
an alternative name for the invertebrate phylum Coelenterata, giving emphasis to the stinging structures as characteristic of the phylum.

< Neo-Latin; see cnida, -aria Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

phylum of stinging invertebrates, from Mod.L. cnida, from Gk. knide "nettle," from stem of knizein "to scratch scrape."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for Cnidaria
The rest of this article deals only with jellyfish in the phylum cnidaria.
Systematics systematics within the cnidaria, as with all organisms, are always in flux.
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