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picture tube the cathode-ray tube in a television receiver, with a screen at one end on which televised images appear.
pneumoencephalogram an x-ray of the spaces in the brain that contain fluid, after the replacement of the cerebrospinal fluid by air or gas.
quillback a North American freshwater fish in which one ray of the dorsal fin is elongated.
radiogram an x-ray print; autoradiogram; radiograph. [1/2 definitions]
radiograph to make an autoradiograph from; expose to x-ray film. [1/2 definitions]
Roentgen ray (sometimes l.c.) see "x-ray."
stigmatism the condition of a lens, and an eye functioning normally, wherein a light ray coming from a point is focused upon clearly. [1/2 definitions]
sunbeam a shaft or ray of light from the sun.
tomography a technique of x-ray photography that reveals only one plane of a body's internal structure and eliminates all others.
violet ray an ultraviolet ray. [1/2 definitions]