/ Dictionary / Index S SOS: Meaning and Definition of Find definitions for: SOS Pronunciation: [key] —n. any call for help: We sent out an SOS for more typists. —v.i. to send an SOS. SOS Pronunciation: [key] See s.o.s. Pronunciation: [key] (in prescriptions) if necessary. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sos (Thesaurus) sorus Soseki Related Content Daily Word Quiz: garrulous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language