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[nahy-dair-ee-uh] /naɪˈdɛər i ə/
noun, Zoology.
an alternative name for the invertebrate phylum Coelenterata, giving emphasis to the stinging structures as characteristic of the phylum.
Origin of Cnidaria
From New Latin; See origin at cnida, -aria Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for Cnidaria
Historical Examples
  • Real parasites are not numerous among the sponges and Cnidaria.

    The Wonders of Life Ernst Haeckel
  • On the other hand, the Cnidaria develop into higher radial (star-shaped) persons, and the platodes into lower bilateral persons.

    The Wonders of Life Ernst Haeckel
  • Self-cleavage is also found among the higher multicellular organisms—namely, the Cnidaria (polyps, medus).

    The Wonders of Life Ernst Haeckel
  • Flagellated epithelium is especially found in the Cnidaria and platodes; ciliated epithelium mostly in the vermalia and mollusca.

    The Wonders of Life Ernst Haeckel
  • I began with the consideration of the simplest sponges (olynthus) and Cnidaria (hydra).

    The Wonders of Life Ernst Haeckel
  • In this way is formed a ring of tentacles, the most characteristic organs of the Cnidaria.

Word Origin and History for Cnidaria

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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