jel·ly·fish (j l  -f sh )n. pl. jellyfish or jel·ly·fish·es 1. Any of numerous marine coelenterates of the class Scyphozoa, some poisonous species of which, notably the Portuguese man-of-war, produce a toxin that can be injected into the skin by nematocysts on the tentacles, causing linear wheals. 2. Any of various similar or related coelenterates. |
jellyfish
members of the class of aquatic animals the Scyphozoa, the true jellyfishes, in the phylum Cnidaria. All possess cnidia or stings and are capable of causing stings to animals.
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