Definition of "Castor"

(Greek mythology) One of the Dioscuri

(astronomy) A double star in the constellation Gemini; alpha (α) Geminorum.  examples

A village and civil parish in city of Peterborough district, Cambridgeshire, England (OS grid ref TL1298).  examples

A town in Alberta, Canada. From French castor (“beaver”).  examples

A village in Bienville Parish, Louisiana, United States. From French castor (“beaver”).  examples

A surname.  examples