Rhizostomata

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Rhizostomata \Rhi`zo*stom"a*ta\, n. pl. [NL., fr. Gr. ??? a root
     + ???, ????, a mouth.] (Zool.)
     A suborder of Medusae which includes very large species
     without marginal tentacles, but having large mouth lobes
     closely united at the edges. See Illust. in Appendix.
     [1913 Webster]