"waterwheels" in the noun sense
1. waterwheel, water wheel
a wheel with buckets attached to its rim raises water from a stream or pond
2. waterwheel, water wheel
a wheel that rotates by direct action of water a simple turbine
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License