/ Dictionary / Index S sodium-vapor lamp: Meaning and Definition of Find definitions for: so'dium-va•por lamp" Pronunciation: (sō'dē-um-vā"pur), [key] — Elect. Elect. 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 Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sodium tripolyphosphate Sodom Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language