A reddish-brown oily 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.
late Middle English (in the sense 'beaver'): from Old French or Latin, from Greek kastōr.
Definition of castor in:
- The British & World English dictionary