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sumac

or sumach

noun

  1. any of various shrubs and small trees (genus Rhus) of the cashew family, including poison sumac and several nonpoisonous plants
  2. the pulverized dried leaves of some of these nonpoisonous plants (esp. Rhus coriaria), used in tanning and dyeing
  3. the wood of any of these plants

See sumac in American Heritage Dictionary 4

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