There are 2 main definitions of castor in English:

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castor1

Syllabification: cas·tor
Pronunciation: /ˈkastər
 
/

noun

A reddish-brown oily substance secreted by beavers, used in medicine and perfumes.
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.

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There are 2 main definitions of castor in English:

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Castor2

Syllabification: Cas·tor
Pronunciation: /ˈkastər
 
/
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.

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