Xylidic

a. Chem. [f. XYL-IC + -ID⁴ + -IC.] Xylidic acid: either of two isomeric substances obtained by the oxidation of xylic and paraxylic acids: see quot. Hence Xylidate [-ATE⁴], a salt of xylidic acid.

1872.  Watts, Dict. Chem., Suppl. 1130. Xylidic acid. C⁹H⁸O⁴…. This bibasic acid … is formed … by the oxidation of xylic or paraxylic acid. Ibid., Calcium xylidate, C⁹H⁶O⁴Ca, forms indistinct white scales, very soluble in water.