† melanotannicadj. [ < melano-comb. form + tannicadj.] ChemistryObsoletemelanotannic acid, a black substance derived from tannic or gallic acid (see quot. 18522).
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1852 C. MorfitArt of Tanning, Currying, & Leather-dressing (1853) 63Melanotannic acid.
1852 W. T. BrandeDict. Sci., Lit. & Art (ed. 2) Suppl. 1385/1Melanotannic Acid, the black substance formed by the action of excess of potassa upon tannic or gallic acid.