mercury-vapor lamp

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

Origin of mercury-vapor lamp

First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018