paranthracene

from The Century Dictionary.

• noun A white, crystalline, polymeric anthracene, (C₁₄H₁₀)₂, which crystallizes from a saturated solution of anthracene in xylene when exposed to sunlight. Other solvents, as benzene or alcohol, can be used. It melts at 244° C., and is much more stable than anthracene.

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

• noun (Chem.) An inert isomeric modification of anthracene.

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

• noun chemistry An inert isomeric modification of anthracene.