water mill

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A mill with machinery that is driven by water.

from The Century Dictionary.

• noun A mill whose machinery is driven by water.

from the GNU version of the Collaborative International Dictionary of English.

• A mill whose machinery is moved by water; -- distinguished from a windmill, and a steam mill.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a mill powered by a water wheel