The Collaborative International Dictionary
Monobasic
Monobasic \Mon`o*ba"sic\, a. [Mono- + basic.] (Chem.) Capable of being neutralized by a univalent base or basic radical; having but one acid hydrogen atom to be replaced; -- said of acids; as, acetic, nitric, and hydrochloric acids are monobasic.
Wiktionary
monobasic
a. 1 (context chemistry of an acid English) containing one replaceable hydrogen atom 2 (context chemistry of a salt English) having one atom of a univalent metal