Source : Webster's Revised Unabridged Dictionary (1913)

Barytes \Ba*ry"tes\, n. [Gr. ? heavy: cf. Gr. ? heaviness, F.
   baryte.] (Min.)
   Barium sulphate, generally called {heavy spar} or {barite}.
   See {Barite}.

Source : WordNet®

barytes
     n : a white or colorless mineral (BaSO4); the main source of
         barium [syn: {heavy spar}, {barite}, {barium sulphate}]