a. Chem. [f. BI- pref.2 1 + BASE sb.1 + -IC.] Having two bases. Bibasic acid: one which contains two atoms of displaceable hydrogen (e.g., H2SO4), and can therefore form two series of salts, normal (e.g., K2SO4) and acid (e.g., KH SO4). Now more commonly DI-BASIC.
1847–9. Todd, Cycl. Anat. & Phys., IV. 80/2. The bibasic phosphate of ammonia and magnesia.
1876. Harley, Mat. Med., 314. Oxalic acid is bibasic.
