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Meaning of mercury-vapor lamp

mer'cu•ry-va•por lamp"

Pronunciation: (mûr'kyu-rē-vā"pur), [key]
— Elect. Elect.
  1. a lamp producing a light with a high actinic and ultraviolet content by means of an electric arc in mercury vapor.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.