Jellyfish

Pronunciation

Origin

From jelly + fish.

Full definition of jellyfish

Noun

1. (zoology) An almost transparent aquatic being; any one of the acalephs, especially one of the larger species, having a jellylike appearance.
1. A cnidarian, a member of the phylum Cnidaria.
1. A scyphozoan, a member of the class Scyphozoa (the true jellies).
2. A ctenophore, a member of the phylum Ctenophora (the comb jellies).

Usage notes

Some writers prefer the term jelly, which does not imply that it is a type of fish.