of rays
121major rays — the fin rays counted in describing and identifying a fish. Includes branched rays and one unbranched ray, omits anterior rudiments. See, e.g., dorsal fin ray count for details. Also called principal rays …
122cathode rays — n. streams of electrons projected from the surface of a cathode: cathode rays produce X rays when they strike solids * * * …
123Expédition De Rays — Carte de la Nouvelle France Publicité sur la Nouvelle France L’expédition De Rays f …
124actinic rays — n pl radiation (as in the violet and ultraviolet parts of the spectrum) having marked photochemical action * * * light rays that produce chemical changes. In general, light rays have more of this property the farther they are from the center of… …
125gamma rays — electromagnetic radiation of wavelengths shorter than X rays, given off by certain radioactive substances. Gamma rays used in nuclear medicine tend to have higher energy than diagnostic X rays, with greater penetration; they are harmful to living …
126ultraviolet rays — invisible short wavelength radiation beyond the violet end of the visible spectrum. Sunlight contains ultraviolet rays, which are responsible for the production of both suntan and on overexposure sunburn. The dust and gases of the earth s… …
127glass rays — the rays formed in an x ray tube by the cathode rays striking the glass wall of the tube, so called to distinguish them from the x rays originating at the anticathode …
128grenz rays — very soft x rays with a wavelength of about 20 nm, lying between x rays and ultraviolet rays in the electromagnetic spectrum …
