phlorone

from The Century Dictionary.

• noun A yellow crystalline substance, C₈H₈O₂ or 1, 4-dimethylquinone, formed by distilling cresol from coal- or beech-tar with sulphuric acid and pyrolusite. It is also made by oxidizing certain amino compounds. Also called p-xyloquinone.

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

• noun (Chem.) A yellow crystalline substance having a peculiar unpleasant odor, resembling the quinones, and obtained from beechwood tar and coal tar, as also by the oxidation of xylidine; -- called also xyloquinone.

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

• noun organic chemistry A yellow crystalline substance resembling the quinones and obtained from beechwood tar and coal tar, or by the oxidation of xylidine.