Medical Dictionary
poison sumac
noun poison su·mac \-ˈs(h)ü-ˌmak\
Medical Definition of POISON SUMAC
: an American swamp shrub of the genus Rhus (R. vernix synonym Toxicodendron vernix) that has smooth pinnate leaves, greenish flowers, and greenish white berries and produces an irritating oil—called also poison dogwood
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