Source : Webster's Revised Unabridged Dictionary (1913)

Proteidea \Pro`te*id"e*a\, n. pl. [NL. See {Proteus}, and
   {-oid}.] (Zo["o]l.)
   An order of aquatic amphibians having prominent external
   gills and four legs. It includes Proteus and Menobranchus
   ({Necturus}). Called also {Proteoidea}, and {Proteida}.