RHUS

[rhus] n, pl rhus.es or rhus [NL, fr. L, sumac, fr. Gk rhous] (ca. 1611): any of a genus (Rhus) of shrubs and trees (as sumac or poison ivy) of the cashew family that are native to temperate and warm regions, have compound trifoliolate or pinnate leaves, and sometimes produce substances causing dermatitis