Propeller (noun)

A device consisting of a central hub with radiating blades that rotates to push against air or water, providing thrust for propulsion of a vehicle such as an airplane or boat.

Origin:

From latin propellere, from pro- "forward" + pellere "to drive".

Examples:

1. The airplane's propeller whirred to life as the pilot revved the engines.
2. The boat's propeller was damaged in the accident and had to be replaced.
3. The helicopter's propeller blades were spinning rapidly as it lifted off the ground.
4. The submarine's propeller pushed it through the water at high speeds.
5. The model airplane's propeller spun round and round as it flew through the air.