There are 3 definitions of castor in English:

castor1

Line breaks: cas¦tor
Pronunciation: /ˈkɑːstə
 
/
(also caster)

noun

1Each of a set of small swivelling wheels fixed to the legs or base of a heavy piece of furniture so that it can be moved easily.
More example sentences
  • The chair has four legs, pedestal or swivel base with castors.
  • The cleaner can be used on all coverings, from shagpile carpets to wooden floorboards and ceramic tiles, and is fitted with a soft tread on the castors and wheels to protect even the most sensitive floor coverings.
  • The base is available with castors for hard or soft floors.
2A small container with holes in the top, especially one used for sprinkling sugar or pepper.

Origin

late 17th century (in sense 2): originally a variant of caster, in the general sense 'something that casts'.

Definition of castor in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up

There are 3 definitions of castor in English:

castor2

Line breaks: cas¦tor
Pronunciation: /ˈkɑːstə
 
/

noun

[mass noun]
An oily reddish-brown substance secreted by beavers, used in medicine and perfumes.
More example sentences
  • Beavers produce scent from their castor glands that creates a reddish stain on mounds of grass and mud that they build at the water's edge.

Origin

late Middle English (in the sense 'beaver'): from Old French or Latin, from Greek kastōr.

Definition of castor in:

There are 3 definitions of castor in English:

Castor3

Line breaks: Cas¦tor
Pronunciation: /ˈkɑːstə
 
/
1 Greek Mythology The twin brother of Pollux. See Dioscuri.
2 Astronomy The second-brightest star in the constellation Gemini, close to Pollux. It is a multiple star system, the three components visible in a moderate telescope being close binaries.

Definition of castor in: