/ Dictionary / Index I interferon: Meaning and Definition of Find definitions for: in•ter•fer•on Pronunciation: (in"tur-fēr'on), [key] — n. any of various proteins, produced by virus-infected cells, that inhibit reproduction of the invading virus and induce resistance to further infection. Also calledan interferon produced by genetically engineered bacteria and harvested for use against hairy cell leukemia. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: interferon (Thesaurus) interferometer interfertile Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language