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sodium-vapor lamp

American

[soh-dee-uhm-vey-per] / ˈsoʊ di əmˌveɪ pər /

noun

Electricity.

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.

First recorded in 1935–40

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023