Definify.com

Webster 1913 Edition

Adj.

[

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

hexacid ‎(not comparable)

(chemistry) Having six atoms or radicals capable of being replaced by acids; hexatomic; hexavalent.
Mannitol is a hexacid alcohol.