water-wheel

noun

a wheel or turbine turned by the weight or momentum of water and used to operate machinery.

a wheel with buckets for raising or drawing water, as a noria.

the paddle wheel of a steamboat.

Also, water wheel.

Origin:
1375–1425; late Middle English; see water, wheel

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet

waterwheel
noun
1.	a wheel with buckets attached to its rim; raises water from a stream or pond
2.	a wheel that rotates by direct action of water; a simple turbine

WordNet® 3.0, © 2006 by Princeton University.
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Relevant Questions

00:10

Water-wheel is always a great word to know.

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a gadget; dingus; thingumbob.

a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

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wa·ter·wheel