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

Alternative form of Roentgen-ray

(of fish) In the Actinopterygii taxonomic class of fish, all having in common lepidotrichia (a kind of fin made of webs of skin supported by bony or horny spines).

Any of the group of rays of the order Torpedodiniformes, which can produce an electric discharge.

plural of x-ray

(computer graphics) A technique that produces realistically shaded images by projecting imaginary light rays to determine which parts of an object should be illuminated.

(physics) A path a photon or a group of photons takes through space, visible as a column of light. / (idiomatic) An inspiring or enlightening person or thing.

plural of ray of light

attributive form of gamma ray

(computer graphics) The calculation of intersections between a ray and a surface.