(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

A meteorological optical phenomenon similar to a crepuscular ray, but appearing opposite the Sun in the sky.

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

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

plural of ray-gun

An ultrasoft X-ray used in treating various skin diseases.

(botany) any of the bands of cells in various trees extending across the wood from the pith to the bark / (anatomy) the middle part of a cortical lobule in the kidney