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The Collaborative International Dictionary of English v.0.48:

Dibasic \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. [1913 Webster] 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. [1913 Webster]