castor
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castor¹
- /ˈkɑːs.tə/ UK
- /ˈkæs.tɚ/ US
Sounds like caster · Rhymes with -ɑːstə(ɹ), -æstə(ɹ)
Where it comes from
From Middle French castor, from Old French castor (“beaver”), from Latin castor (“beaver”), from Ancient Greek κάστωρ (kástōr), from Doric Greek κάστον (káston, “wood”).
noun castors
- A hat made from the fur of the beaver. I have been always noted for the jaunty manner in which I wear my castor—[…]
-
A heavy quality of broadcloth for overcoats.
Similar: beaver
- Castoreum (bitter exudate of mature beavers).
- Any of various nymphalid butterflies of the genus Ariadne, of Africa and Asia.
castor²
- /ˈkɑːs.tə/ UK
- /ˈkæs.tɚ/ US
Sounds like caster · Rhymes with -ɑːstə(ɹ), -æstə(ɹ)
Where it comes from
Named from Greek mythology; see Castor and Pollux. The name pollux was given to another mineral with which it was always found.
noun
-
A variety of petalite found in Elba.
Similar: castorite
castor³
- /ˈkɑːs.tə/ UK
- /ˈkæs.tɚ/ US
Sounds like caster · Rhymes with -ɑːstə(ɹ), -æstə(ɹ)
Where it comes from
Alternative spelling of caster, via cast + -or (the Latinate varient of -er).
noun castors
- A pivoting roller attached to the bottom of furniture to allow it to be moved.
- A container with a perforated cap for sprinkling its contents, especially salt, pepper, etc. Mrs. Hussey soon appeared, with a mustard-pot in one hand and a vinegar-cruet in the other, having just broken away from the occupation of attending to the castors, and scolding her little black boy meantime.
Castor⁴
- /ˈkɑːs.tə/ UK
- /ˈkæs.tɚ/ US
Where it comes from
From Ancient Greek Κάστωρ (Kástōr), from Ancient Greek κάστωρ (kástōr, “beaver”).
proper noun
- One of the Dioscuri
- A double star in the constellation Gemini; alpha (α) Geminorum.
- A village and civil parish in city of Peterborough district, Cambridgeshire, England (OS grid ref TL1298).
- A town in the County of Paintearth, Alberta, Canada. From French castor (“beaver”).
- A village in Bienville Parish, Louisiana, United States. From French castor (“beaver”).
- A surname.
Thesaurus
Closest in meaning: beaver, caster, alpha geminorum, genus castor, pomace, calm, castoreum, beaverkin, beanie, furcap, beehive, hunting cap, ski cap, beenie, beaverteen, stocking cap
Translations
Talk about this word "castor." Wiktionary, via Micwyn, micwyn.com/word/castor. Accessed 6 Nov. 2026. castor. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/castor "castor." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/castor.Cite this
@misc{castor_2026,
title = {castor},
howpublished = {Wiktionary, via Micwyn},
year = {2026},
url = {https://micwyn.com/word/castor},
urldate = {2026-11-06}
}
