Wiktionary
mellitic anhydride
n. (context organic compound English) The acid anhydride of mellitic acid
Wikipedia
Mellitic anhydride
Mellitic anhydride, the anhydride of mellitic acid, is an organic compound with the formula CO.
Mellitic anhydride is an oxide of carbon ( oxocarbon), like CO, CO, and CO. It is a white sublimable solid, apparently obtained by Liebig and Wöhler in 1830 in their study of mellite (" honey stone"); they assigned it the formula CO The substance was properly characterized in 1913 by H. Meyer and K. Steiner. It retains the aromatic character of the benzene ring.