/ Dictionary / Index S synchro-: Meaning and Definition of Find definitions for: synchro- Pronunciation: [key] a combining form representingorin compound words: synchroscope; synchrotron. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: synchro- (Thesaurus) sync-generator synchrocyclotron 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