/ Dictionary / Index S syphon: Meaning and Definition of Find definitions for: sy•phon Pronunciation: (sī'fun), [key] — n., v.t., v.i. siphon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: syphon (Thesaurus) syphiloid Syr. Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language