/ Dictionary / Index S spark spectrum: Meaning and Definition of Find definitions for: spark' spec"trum Pronunciation: [key] — Physics. Physics. a spectrum formed from the light produced by an electric spark, characteristic of the gas or vapor through which the spark passes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sparks spark transmitter Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language