urushiol
noun
uru·shi·ol
yu̇-ˈrü-shē-ˌȯl
u̇-ˈrü-,
-ˌōl
: a mixture of catechol derivatives with saturated or unsaturated side chains of 15 or 17 carbon atoms that is an oily toxic irritant substance present in poison ivy and some related plants (such as poison oak and poison sumac)
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Merriam-Webster unabridged
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