The transparent or semitransparent glass front of a cathode-ray tube, through which the image is viewed or projected; the inner surface of the face is coated with fluorescent chemicals that emit light when hit by an electron beam. Also known as face.

1. A disk fixed perpendicularly to the spindle of a lathe and used for attachment of the workpiece.

2. A protective plate used to cover holes in machines or other devices.

3. In scuba or skin diving, a glass or plastic window positioned over the face to provide an air space between the diver's eyes and the water.