adjective Chemistry.
containing two replaceable or ionizable hydrogen atoms: dibasic acid.
having two univalent, basic atoms, as dibasic sodium phosphate, Na 2 HPO 4 .

1865–70; di-1 + basic

dibasicity [dahy-bey-sis-i-tee] , noun
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World English Dictionary
dibasic (daɪˈbeɪsɪk)
1.  Compare diacidic (of an acid, such as sulphuric acid, H2SO4) containing two acidic hydrogen atoms
2.  (of a salt) derived by replacing two acidic hydrogen atoms: dibasic sodium phosphate, Na2HPO4

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Medical Dictionary

dibasic di·ba·sic (dī-bā'sĭk)

  1. Containing two replaceable hydrogen atoms.

  2. Or or relating to salts or acids forming salts with two atoms of a univalent metal.

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Science Dictionary
dibasic   (dī-bā'sĭk)  Pronunciation Key 
  1. Relating to an acid that contains two hydrogen atoms that can be replaced by metal ions. Sulfuric acid (H2SO4) is a dibasic acid. The hydrogens can be replaced by sodium and hydrogen to form sodium hydrogen sulfate (NaHSO4) or by two sodium atoms to form sodium sulfate (Na2SO4).

  2. Relating to a compound that contains two basic monovalent groups or atoms.

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