large siphonophore having a bladderlike float and stinging tentacles
any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans
An almost transparent aquatic animal; any one of the acalephs, especially one of the larger species, having a jellylike appearance.
A cnidarian, a member of the phylum Cnidaria.
The name "jellyfish" comes from the words "jelly" and "fish," describing an aquatic creature that is gelatinous like jelly. Although the term was coined in the mid-19th century to replace older names like "sea jelly," these animals are not biologically classified as fish.