One of the mysteries of the English language finally explained.
Any jellyfish of the scyphozoan order Rhizostomeae (or Rhizostomae), characterized by having eight highly branched oral arms containing numerous tiny suctorial mouths, and by a lack of tentacles.
Early 19th century; earliest use found in Belfast Monthly Magazine. From rhizo- + -stome, after either scientific Latin Rhizostoma, genus name or French rhizostome. In later use perhaps also partly after scientific Latin Rhizostomeae (or Rhizostomae), order name.
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