A projector capable of projecting enlarged images of written or pictorial material onto a screen or wall from a transparency placed horizontally below the projector and lighted from underneath
An overhead projector is a machine that has a light inside it and makes the writing or pictures on a sheet of plastic appear on a screen or wall. The abbreviation OHP is also used. A projector capable of projecting enlarged images of written or pictorial material onto a screen or wall from a transparency placed horizontally below the projector and lighted from underneath. OHP a piece of electrical equipment used when giving a talk, which shows words or pictures on a wall or large screen so that many people can see them