Definitions

1. noun

A person who sells or deals in oil or other commodities, especially at a market or exchange.

“The castor was a busy trader, known for his fair prices.”

2. noun

The bean of the castor oil plant, used as a source of oil and as a food for pigeons and other birds.

“The castor bean is a popular snack for birds in the park.”

3. noun

A device or wheel with a row of spokes that is used to transmit power, especially a pulley or a wheelbarrow.

“The castor on the wheel made it easier to move the heavy load.”

4. proper noun

The name of a constellation, also known as the Great Bear.

“The castor is one of the most recognizable constellations in the night sky.”

5. noun

A type of bean that is used as a source of oil and as a food for birds.

“The castor bean is a popular ingredient in some recipes.”