- jellyfish, medusa, medusan - any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans
--1 is a kind of coelenterate, cnidarian
--1 is a member of Cnidaria, phylum Cnidaria, Coelenterata, phylum Coelenterata
--1 has particulars: Aegina; Chrysaora quinquecirrha