A genus of poisonous plants (family Anacardiaceae), also known as Rhus, with smooth fruits and foliage that contain urushiol, which produces a contact dermatitis (rhus dermatitis); species include poison ivy (T. radicans), poison oak (T. diversilobum), and poison sumac (T. vernix) [toxico- + G. dendron, tree]
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Tox·i·co·den·dron .täk-si-kō-'den-.drän n a genus of shrubs and trees of the cashew family (Anacardiaceae) that includes poison ivy and related plants when they are split off from the genus Rhus
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Tox·i·co·den·dron (tok″sĭ-ko-denґdron) [toxico- + Gr. dendron tree] name often used for only the poisonous species of Rhus.Medical dictionary. 2011.