/ Dictionary / Index S sniffer: Meaning and Definition of Find definitions for: sniff•er Pronunciation: (snif'ur), [key] — n. a person or thing that sniffs. a device or mechanism for detecting something. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sniffer (Thesaurus) sniff sniffish 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