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urushiol Definition

uru·shiol (o̵̅o̅ro̵̅o̅ s̸hē ôl′, o̵̅o̅ ro̵̅o̅-; -ōl′)

noun

a poisonous, irritant liquid, CHO, present in poison ivy, poison sumac, etc.

Etymology: Jpn urushi, lac tree, lacquer + -ol: coined (1907) by Toshiyuki Mashima, who isolated it

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