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.

Source: Webster's Revised Unabridged Dictionary (1913)