Click any word in a definition or example to find the entry for that word
a machine that mixes cement, sand, and water to make concrete
a machine that mixes cement, sand, small stones, and water to make concrete
a type of projector used in the past for making pictures appear on a wall or screen
an overhead projector
a piece of equipment used for showing films or slides on a screen
a system of electrical equipment used for speaking or playing music in a large building or area. The more usual word is PA system.
a pump that creates a vacuum in an enclosed space