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Dictionary

pso•ra•len

Pronunciation: (sôr'u-lun, sōr'-), [key]
—n. Pharm.
a toxic substance, C₁₁H₆O₃, 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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

psora

psoriasis

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