adj. Having two replaceable hydrogen atoms; dibasic.
the GNU version of the Collaborative International Dictionary of English
adj. Having to hydrogen atoms which can be replaced by positive or basic atoms or radicals to form salts; -- said of acids. See dibasic.
The Century Dictionary and Cyclopedia
Literally, having two bases: in chem., applied to acids (such as sulphuric acid, H2SO4) which have two hydrogen atoms replaceable by a base or bases. See monobasic, tribasic, dibasic, and polybasic.
Word Usage
"Among these may be mentioned -- Alder Wright's method of using an ammoniacal salt, the acid radicle of which neutralises the caustic alkali, ammonia being liberated; the use of sodium and potassium bibasic phosphate (Eng.Pat. 25,357, 1899); a substance formed by treating albumen with formalin"