Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of a group of chemical compounds found naturally in certain plants that are used in the treatment of psoriasis and vitiligo.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of a group of furanocoumarins, from the seeds of various plants, that are used to treat psoriasis, eczema and vitiligo

Etymologies

From New Latin Psōralea, plant genus, from Greek psōralea, neuter pl. of psōraleos, mangy (from the appearance of the plants' leaves), from psōrā, itch.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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