Tiller (noun)

1. A lever or handle used to steer a boat.
2. A handle or lever used to control the direction of movement in a vehicle or machine.
3. A tool used for tilling soil, typically a horizontal beam with a vertical handle that is attached to a plow or cultivator and used to guide it.

Origin:

From the verb till, meaning to prepare land for cultivation by breaking it up with a plow or hoe.

Examples:

1. He adjusted the tiller to steer the boat into the wind.
2. The tiller on the tractor is used to control the direction of movement.
3. He used the tiller to break up the soil in the field.
4. The tiller was used to steer the old fashioned car.
5. The tiller on the bike is used to control the direction of the front wheel.