Definition of urushiol in English:

urushiol

Line breaks: uru¦shiol
Pronunciation: /ʊˈruːʃɪɒl
 
/

noun

[mass noun] Biochemistry
  • An oily liquid which is the main constituent of Japanese lacquer and is responsible for the irritant properties of poison ivy and other plants. It consists of a mixture of catechol derivatives.
    More example sentences
    • All parts of the poison ivy plant produce the oily irritating agent, urushiol.
    • Poison ivy, poison oak, and poison sumac all contain the same allergic irritant: urushiol.
    • Unfortunately, the study also found that carbon dioxide-enhanced poison ivy boasts a stronger strain of urushiol, which may prove even more poisonous to humans.

Origin

early 20th century: from Japanese urushi 'Japanese lacquer' + -ol.

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Pronunciation: skəʊʃ
noun
a small amount; a little