/ Dictionary / Index S speed light: Meaning and Definition of Find definitions for: speed' light" Pronunciation: [key] — Photog. Photog. an electronic flash lamp. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. speeding speed limit Related Content Daily Word Quiz: illegible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language