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urticaceous
urticaria
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urushiol
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urushiol
u·ru·shi·ol [  rshee àwl ]


noun 
Definition:
 
oily irritant: an oily poisonous irritant found in the resin and on the leaves and stems of poison ivy, the lacquer tree, and some related plants
[Early 20th century. < Japanese urushi "lacquer" + -ol1]
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