[ 'sɔ:rəlɛn ]
■ noun Chemistry any of a group of cyclic compounds present in certain plants, used to treat psoriasis and other skin disorders.
Origin
1930s: from mod. L. Psoralea (former plant genus name), from Gk psōraleos 'itchy' (from psōra 'itch') + the suffix -en (cf. -ene ).