First Known Use: 14th century
Dictionary
castor
noun cas·tor \ˈkas-tər\
Definition of CASTOR
1
: beaver 1a
2
3
: a beaver hat
ADVERTISEMENT
Origin of CASTOR
Middle English, from Latin, from Greek kastōr, from Kastōr Castor
Castor
noun Cas·tor \ˈkas-tər\
Definition of CASTOR
1
: one of the Dioscuri
2
: the more northern of the two bright stars in Gemini
See Castor defined for kids Origin of CASTOR
Latin, from Greek Kastōr
First Known Use: 15th century
Learn More About CASTOR
Browse
Next Word in the Dictionary: castor beanPrevious Word in the Dictionary: cast onAll Words Near: castor
ADVERTISEMENT
Seen & Heard
What made you want to look up castor? Please tell us where you read or heard it (including the quote, if possible).