a. Chem. [f. EQUISET-UM + -IC.] Derived from Equisetum. Equisetic acid, obtained from Equisetum fluviatile, is now known to be identical with ACONITIC acid.
1838. T. Thomson, Chem. Org. Bodies, 54. When malic acid is distilled at the temperature of 349°, it is resolved into water, and two pyro-acids, which are isomeric. These acids have been distinguished by the names of equisetic or maleic, and fumaric or paramaleic acid.
1876. Harley, in Royle’s Mat. Med., 771. Aconitia is combined in the root with aconitic or equisetic acid.
