sodium-vapor lamp

[soh-dee-uh m-vey-per]

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.

Origin of sodium-vapor lamp

First recorded in 1935–40

Also called sodium lamp.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018