mercury vapor lamps

mercury-vapor lamp

[mur-kyuh-ree-vey-per]
noun Electricity.
a lamp producing a light with a high actinic and ultraviolet content by means of an electric arc in mercury vapor.

Origin:
1900–05

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
mercury-vapor lamp

noun
ultraviolet lamp that emits a strong bluish light (rich in ultraviolet radiation) as electric current passes through mercury vapor 
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