The Collaborative International Dictionary
Hexacid
Hexacid \Hex`ac"id\, a. [Hex- + acid.] (Chem.) Having six atoms or radicals capable of being replaced by acids; hexatomic; hexavalent; -- said of bases; as, mannite is a hexacid base.
Wiktionary
hexacid
a. (context chemistry English) Having six atoms or radicals capable of being replaced by acids; hexatomic; hexavalent.