Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

urushiol

play
noun uru·shi·ol \yu̇-ˈrü-shē-ˌȯl, u̇-ˈ, -ˌōl\

Definition of urushiol

  1. :  a mixture of catechol derivatives with saturated or unsaturated side chains of 15 or 17 carbon atoms that is an oily toxic irritant principle present in poison ivy and some related plants (genus Rhus) and in lacquers derived from such plants



Origin of urushiol

International Scientific Vocabulary, from Japanese urushi lacquer + International Scientific Vocabulary 1-ol


First Known Use: 1908


Medical Dictionary

urushiol

play play
noun uru·shi·ol \(y)u̇-ˈrü-shē-ˌȯl, -ˌōl\

Medical Definition of urushiol

  1. :  a mixture of pyrocatechol derivatives with saturated or unsaturated side chains of 15 or 17 carbon atoms that is an oily toxic irritant principle present in poison ivy and some related plants of the genus Rhus




Learn More about urushiol


Seen and Heard

What made you want to look up urushiol? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 7, 2016

a slight offense

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1037863653

Which of the following refers to thin, bending ice, or to the act of running over such ice?

kittly-benders duvet pince-nez spindrift
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ