any of various derivatives of coumarin used in drugs to treat psoriasis, etc.: when activated by sunlight it causes the skin to darken
Origin of psoralen; from Modern Latin Psoralea, genus name (see psoralea): the substance was first isolated from a species of this genus
Any of a group of chemical compounds found in certain plants, used to treat psoriasis and vitiligo.
Origin of psoralenFrom New Latin Ps&omacron;ralea, plant genus, from Greek ps&omacron;ralea, neuter pl. of ps&omacron;raleos, mangy (from the appearance of the plants' leaves), from ps&omacron;ra, itch.