a machine with a large revolving drum in which cement is mixed with other materials to make concrete
A cement mixer is a machine with a large revolving container into which builders put cement, sand, and water in order to make concrete. A machine, often mounted on a truck, having a revolving drum in which cement, sand, gravel, and water are combined into concrete. a machine with a round drum that turns around, into which you put cement, sand, and water to make concrete