mustard oil

noun

Medical Definition of mustard oil 

1 : a colorless to pale yellow pungent irritating essential oil that is obtained by distillation from the seeds usually of black mustard after expression of the fatty oil and maceration with water, that consists largely of allyl isothiocyanate, and that is used especially in liniments and medicinal plasters — compare sinigrin

2a : allyl isothiocyanate

b : an isothiocyanate ester

Learn More about mustard oil

Share mustard oil

Dictionary Entries near mustard oil

must

mustard

mustard gas

mustard oil

mustard plaster

mutability

mutable

Comments on mustard oil

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

WORD OF THE DAY

a soft lustrous wool fabric with mohair

Get Word of the Day daily email!

Test Your Vocabulary

Late Autumn 2018 Words of the Day Quiz

  • frosted-autumn-leaves
  • Which is a synonym of yahoo?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

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

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!