\Di*ba"sic\, a. [Pref. di- + basic.] (Chem.)
Having two acid hydrogen atoms capable of replacement by
basic atoms or radicals, in forming salts; bibasic; -- said
of acids, as oxalic or sulphuric acids. Cf. {Diacid},
{Bibasic}.

Note: In the case of certain acids dibasic and divalent are
      not synonymous; as, tartaric acid is tetravalent and
      dibasic, lactic acid is divalent but monobasic.