cement mixer

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

• noun A revolving container, often mounted on a truck, in which cement, sand, gravel, and water are combined into concrete.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A device used in construction in whicb cement, aggregate and water are slowly mixed together in a revolving drum to form concrete.
• noun A cocktail made of Irish cream and lime juice or lemon juice.

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

• noun a machine with a large revolving drum in which cement is mixed with other materials to make concrete