pyrocitric

from The Century Dictionary.

• Obtained by subjecting citric acid to the action of heat.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Chem.) Pertaining to, or designating, any one of three acids obtained by the distillation of citric acid, and called respectively citraconic, itaconic, and mesaconic acid.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective chemistry Describing any of the three unsaturated dicarboxylic acids obtained by the distillation of citric acid.