The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
a. [ Pref. bi- + acid. ] (Chem.) Having two hydrogen atoms which can be replaced by negative atoms or radicals to form salts; -- said of bases. See Diacid. [ 1913 Webster ]
n. [ L. rubia madder, fr. rubeus red. ] (Chem) A substance found in madder root, and probably identical with ruberythrinic acid. [ 1913 Webster ]
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