(Greek mythology) One of the Dioscuri

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

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

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

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

A hat made from the fur of the beaver.

A heavy quality of broadcloth for overcoats.

Castoreum (bitter exudate of mature beavers).

Any of various nymphalid butterflies of the genus Ariadne, of Africa and Asia.

(mineralogy) A variety of petalite found in Elba.

(especially UK) An alternative spelling of caster, which refers to a pivoting roller attached to furniture for easy movement or a container with a perforated cap for sprinkling salt, pepper, etc.