1. small wheels attached to the bottom of furniture or equipment to make it easy to move
Usage: plural of castor
2. small containers for salt, pepper, or other seasonings, typically part of a set
Usage: plural of castor; British English

Examples

• The office chair has five castors for smooth movement.
• We need to replace the broken castors on the hospital bed.
• The heavy desk rolled easily on its castors.
• She oiled the castors to stop them from squeaking.
• The dining table came with silver castors for salt and pepper.
• Please pass the castors so I can season my food.