castor oil

noun

Definition of castor oil

  1. :  a pale viscous fatty oil from castor beans used especially as a cathartic and as a lubricant and plasticizer

Origin and Etymology of castor oil

probably from its former use as a substitute for castoreum in medicine


First Known Use: 1746


CASTOR OIL Defined for English Language Learners

castor oil

noun

Definition of castor oil for English Language Learners

  • : a thick oil made from a tropical plant and used in the past as a medicine


CASTOR OIL Defined for Kids

castor oil

noun cas·tor oil \ˈka-stər-\

Definition of castor oil for Students

  1. :  a thick yellowish liquid that comes from the seeds (castor beans) of a tropical herb and is used as a lubricant and as a strong laxative


Medical Dictionary

castor oil

noun

Medical Definition of castor oil

  1. :  a pale viscous fatty oil from castor beans used especially as a cathartic or lubricant


Learn More about castor oil


Seen and Heard

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

Love words? Need even more definitions?

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

WORD OF THE DAY

the point at which something begins

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • istock-refers-to-this-as-a-tumble-of-strawberries-which-sounded-pretty-nice-to-us
  • Which is a synonym of garner?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Bee Cubed

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!