jellyfish
1. [ noun ] (zoology) large siphonophore having a bladderlike float and stinging tentacles
Synonyms: man-of-war Portuguese_man-of-war
Related terms: siphonophore Physalia
2. [ noun ] (zoology) any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans
Synonyms: medusan medusa
Related terms: coelenterate Chrysaora_quinquecirrha Aegina Cnidaria