mer·cu·ry-va·por lamp (mûr'kyə-rē-vā'pər) n. A lamp in which ultraviolet and yellowish-green to blue visible light is produced by an electric discharge through mercury vapor.
Main Entry: mer·cu·ry–va·por lamp Pronunciation: -"vA-p&r- Function: noun : an electric lamp in which the discharge takesplace through mercury vapor and which has been used therapeutically as a source of ultraviolet radiation