sodium-vapor lamp

[soh-dee-uhm-vey-per]

so·dium-va·por lamp

[soh-dee-uhm-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.
Also called sodium lamp.


Origin:
1935–40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Sodium-vapor lamp has a plethora of syllables.
So is dichlorodiphenyltrichloroethane. Does it mean:
given to using long words.
a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S.
WordNet
sodium-vapor lamp

noun
lamp in which an electric current passed through a tube of sodium vapor makes a yellow light; used is street lighting 
WordNet® 3.0, © 2006 by Princeton University.
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