sumac

sumac /su·mac/ (soo´mak) name of various trees and shrubs of the genus Rhus.

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poison sumac  a species, Rhus vernix, which causes an itching rash on contact with the skin.

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su·mac or su·mach (smk, sh-)

n.

Any of various shrubs or small trees of the genus Rhus, having compound leaves, clusters of small greenish flowers, and usually red, hairy fruit. Some species, such as the poison ivy and poison oak, cause an acute itching rash on contact.

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sumac

Rhus spp. trees and shrubs.

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poison sumac

toxicodendronvernix.