/ Dictionary / Index S siglos: Meaning and Definition of Find definitions for: sig•los Pronunciation: (sig'los), [key] — pl. -loi a silver coin of ancient Persia, the 20th part of a daric. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sigismund sigma Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language