castor oil
Definition of castor oil
: a pale viscous fatty oil from castor beans used especially as a cathartic and as a lubricant and plasticizer
Indulge Your Inner Word Nerd
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
Definition of castor oil for English Language Learners
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: a thick oil made from a tropical plant and used in the past as a medicine
CASTOR OIL Defined for Kids
castor oil
Definition of castor oil for Students
: 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
Medical Definition of castor oil
: a pale viscous fatty oil from castor beans used especially as a cathartic or lubricant
Learn More about castor oil
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See words that rhyme with castor oil Britannica.com: Encyclopedia article about castor oil
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