/ Dictionary / Index S spectra: Meaning and Definition of Find definitions for: spec•tra Pronunciation: (spek'tru), [key] — n. a pl. of Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: spectra (Thesaurus) spectinomycin spectral Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language