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inert gas any of a group of chemical elements, such as helium and neon, that seldom form compounds with other elements and that are gases at room temperature.
Ne symbol of the chemical element neon.
neon an advertising sign or the like formed from tubular electrical discharge lamps filled with neon or other glowing gases. [3/5 definitions]
sodium-vapor lamp an electric lamp used for lighting highways and streets, containing sodium and neon and giving off a yellow light.