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sodium-vapor lamp

[soh-dee-uh m-vey-per] /ˈsoʊ di əmˌveɪ pər/
noun, Electricity
1.
an electric lamp in which sodium vapor is activated by current passing between two electrodes, producing a yellow, glareless light: used on streets and highways.
Also called sodium lamp.
Origin
1935-1940
1935-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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