Definition of castors:
(n) :
A container with a perforated cap for sprinkling its contents, especially salt, pepper, etc.
(n) :
A pivoting roller attached to the bottom of furniture to allow it to be moved.
(n) :
(especially UK) Alternative spelling of caster, especially in its senses
(n) :
A hat made from the fur of the beaver.
(n) :
A heavy quality of broadcloth for overcoats.
(n) :
Castoreum (bitter exudate of mature beavers).