Source : Webster's Revised Unabridged Dictionary (1913)

Dichromate \Di*chro"mate\, n. (Chem.)
   A salt of chromic acid containing two equivalents of the acid
   radical to one of the base; -- called also {bichromate}.

Source : WordNet®

dichromate
     n : a salt of the hypothetical dichromic acid [syn: {bichromate}]