First Known Use: 14th century
Dictionary
castor
noun cas·tor \ˈkas-tər\
Definition of CASTOR
1
: beaver 1a
2
3
: a beaver hat
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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
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Origin of CASTOR
Latin, from Greek Kastōr
First Known Use: 15th century
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