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Dictionary

poi'son oak'

either of two shrubs, Rhus toxicodendron, of the eastern U.S., or R. diversiloba, of the Pacific coast of North America, resembling poison ivy and causing severe dermatitis when touched by persons sensitive to them. Also called poison ivy.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

poison ivy

poisonous

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