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.

Source: Webster's Revised Unabridged Dictionary (1913)