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paddle wheel a wheel that has boards or paddles fixed at right angles around it. A paddle wheel is used to move a river steamboat.
steamboat A steamboat is a boat that runs on the power of steam. Steam is a gas that is created when water becomes very hot. Steam has the power to make things move. On a steamboat, steam from a boiler makes either a large wheel or propellers turn around and around in the water. Paddles attached to the large wheel push the water away and make the boat move forward. Blades of the propellers do the same thing. Steamboats were common in the nineteenth century, but there are few steamboats now. Boats use different types of power nowadays.