1. (Science: botany) Any plant of the genus rhus, shrubs or small trees with usually compound leaves and clusters of small flowers. Some of the species are used in tanning, some in dyeing, and some in medicine. One, the Japanese Rhus vernicifera, yields the celebrated japan varnish, or lacquer.
(Science: botany) See poison.
Origin: F. Sumac, formerly sumach (cf. Sp. Zumaque), fr. Ar. Summaq
Alternative forms: shumac.