Source : Webster's Revised Unabridged Dictionary (1913)

Gibbartas \Gib*bar"tas\, n. [Cf. Ar. jebb[=a]r giant; or L.
   gibber humpbacked: cf. F. gibbar.] (Zo["o]l.)
   One of several finback whales of the North Atlantic; --
   called also {Jupiter whale}. [Written also {jubartas},
   {gubertas}, {dubertus}.]