Rhizostoma
/ˌrʌɪzəˈstəʊmə/ /rʌɪˈzɒstəmə/Zoology
noun
A genus of scyphozoan jellyfishes that is the typical genus of the order Rhizostomeae; (also rhizostoma) a jellyfish of this genus or (formerly also) order.
Origin
Early 19th century; earliest use found in William Nicholson. From scientific Latin Rhizostoma, genus name from rhizo- + ancient Greek στόμα mouth.