noun. A body form of certain cnidarians such as jellyfish, consisting of a dome-shaped structure with a mouth underneath surrounded by tentacles, and in most species constituting the free-swimming sexual stage of the organism.

noun. Special form that cnidarians may turn into.

"The medusa is a genus of molusca; and I think M. le Seur told me he reckons forty-three or forty-four species of that genus."

medusal  

Coosa  Musa  Ragusa  Siracusa  Susa