/ Dictionary / Index S SN: Meaning and Definition of Find definitions for: SN Pronunciation: [key] Secretary of the Navy. Sn Pronunciation: [key] — Symbol, Chem. tin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sn (Thesaurus) Smyth sewing snack 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