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Any of various invertebrate animals of the phylum Cnidaria, characterized by a radially symmetrical body with a saclike internal cavity and stinging nematocysts, and including the jellyfishes, hydras, sea anemones, and corals.
[New Latin Cnīdāria, phylum name, from Greek knīdē, sea nettle.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Animals) any invertebrate of the phylum Cnidaria, which comprises the coelenterates
(Animals) of, relating to, or belonging to the Cnidaria
[C20: from New Latin Cnidaria, from Greek knidē nettle]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
cni•dar•i•an(naɪˈdɛər i ən)
1. any radially symmetric invertebrate of the phylum Cnidaria, including the hydras, jellyfishes, sea anemones, and corals, characterized by stinging cells and a saclike digestive cavity with a single opening surrounded by tentacles. Compare coelenterate.adj.
2. of or pertaining to the cnidarians.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Any of various invertebrate animals that have a body with radial symmetry, tentacles, and a sac-like internal cavity. They have a single opening for ingesting food and eliminating wastes. Cnidarians include the jellyfishes, hydras, sea anemones, and corals. Also called coelenterate.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||cnidarian - radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms|
coelenteron - the saclike body cavity of a coelenterate
invertebrate - any animal lacking a backbone or notochord; the term is not used as a scientific classification
Cnidaria, Coelenterata, phylum Cnidaria, phylum Coelenterata - hydras; polyps; jellyfishes; sea anemones; corals
polyp - one of two forms that coelenterates take (e.g. a hydra or coral): usually sedentary with a hollow cylindrical body usually with a ring of tentacles around the mouth; "in some species of coelenterate, polyps are a phase in the life cycle that alternates with a medusoid phase"
medusan, medusoid, medusa - one of two forms that coelenterates take: it is the free-swimming sexual phase in the life cycle of a coelenterate; in this phase it has a gelatinous umbrella-shaped body and tentacles
jellyfish - any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans
scyphozoan - any of various usually free-swimming marine coelenterates having a gelatinous medusoid stage as the dominant phase of its life cycle
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