The Collaborative International Dictionary
Hexabasic
Hexabasic \Hex`a*ba"sic\, a. [Hexa- + basic.] (Chem.) Having six hydrogen atoms or six radicals capable of being replaced or saturated by bases; -- said of acids; as, mellitic acid is hexabasic.
Wiktionary
hexabasic
a. 1 (context chemistry of an acid English) containing six replaceable hydrogen atoms 2 (context chemistry of a salt English) having six atoms of a univalent metal