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urushiol

   Also found in: Medical, Wikipedia 0.01 sec.
u·ru·shi·ol  (-rsh-ôl, -l, -l)
n.
A toxic substance present in the resin or on the surface of plants of the genus Rhus, including poison ivy and the lacquer tree, from which a black Japanese lacquer is obtained.

[Japanese urushi, lacquer + -ol1.]

urushiol  (-rsh-ôl, -l)
A toxic substance present in the resin or on the surface of plants of the genus Rhus (syn. Toxicodendron). Urushiol is a mixture of several derivatives of catechol and is the irritating substance in poison ivy.

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