sodium lamp

noun

variants or less commonly sodium-vapor lamp
plural sodium lamps also sodium-vapor lamps
: an electric lamp that contains sodium vapor and electrodes between which a luminous discharge takes place and that is used especially for lighting highways

Word History

First Known Use

1933, in the meaning defined above

Time Traveler
The first known use of sodium lamp was in 1933

Cite this Entry

“Sodium lamp.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sodium%20lamp. Accessed 10 Nov. 2025.

Last Updated: - Entry added
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