(dated) One of the rays that emanate from the outer surface of a plate composed of any material permeable by cathode rays, such as aluminium, which forms a portion of a wall of a vacuum tube, or which is mounted within the tube and exposed to radiation from the cathode.

(physics, obsolete) infrared ray, heat ray

(computer graphics) An advanced form of ray tracing in which the imaginary light rays are not merely computed where they intersect with solid parts of the model, but also sampled and modified as they pass through space.

(physics, archaic) A weak radioactive ray arising from the impact of cathode particles with the molecules of gas contained in an X-ray tube or with the glass walls of the tube.

(physics, archaic) A radioactive ray of any kind.

Alternative form of Roentgen-ray

plural of ray-gun

(mathematics) A number line that has one endpoint (typically at zero)

A room, typically in a royal palace next to a royal bedchamber, in which a monarch would be dressed (arrayed)

One of 114 counties in Missouri, United States. County seat: Richmond. Named after John Ray.