Definition of mesaconic acid in US English:

mesaconic acid

noun

Chemistry
  • An unsaturated dibasic acid, isomeric with itaconic acid and citraconic acid, which can be obtained by boiling a weak solution of citraconic acid with nitric acid; methylfumaric acid, CH₃C(COOH):CHCOOH.

Origin

Mid 19th century; earliest use found in Robert Thomson (1810–1864), medical officer of health.