[sawr-uh-luhn, sohr-]
noun Pharmacology.
a toxic substance, C 1 1 H 6 O 3 , found in certain plants, including parsnips, used to increase the response to ultraviolet light in the treatment of severe cases of acne and psoriasis.
Also called furocoumarin.

1930–35; < Neo-Latin Psoral(ea) name of a genus of plants yielding the compound (< Greek psōraléa, neuter plural of psōraléos mangy, in reference to the glandular dots on the plant; see psoriasis) + -en, variant of -ene Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

psoralen pso·ra·len (sôr'ə-lən)
Any of a group of chemical compounds found naturally in certain plants that are used in the treatment of psoriasis and vitiligo.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Transplanting donated cells that have been treated with psoralen may prevent this from happening.
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