RhymeZone: polybasic definitions

Definitions of polybasic:

adjective: (chemistry, of an acid) containing two or more replaceable hydrogen atoms; see also polyprotic
adjective: (chemistry, of a salt) having two or more atoms of a univalent metal
adjective: (chemistry, of a base) Having two or more basic groups; see also polybase and polyprotic

(Definitions from Wiktionary)