a. Chem. [f. VANILL-A + -IC 1 b.] Vanillic acid, vanillin, or an oxidized form of this.
1868. [see next].
1876. Harley, Royle’s Mat. Med., 385. Vanillin … has, in fact, acid properties, and is therefore appropriately called vanillic acid.
1885. Remsen, Org. Chem. (1888), 304. Vanillic acid … is formed by oxidation of vanillin, which is the corresponding aldehyde.
