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sodium-vapor lamp

[soh-dee-uh m-vey-per]
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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.

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