/ Dictionary / Index I interleukin 1: Meaning and Definition of Find definitions for: in•ter•leu•kin 1 Pronunciation: (in'tur-l"kin), [key] — Immunol. Immunol. any of several proteins released from certain cells, esp. macrophages, and having various effects on the activity of other cells, as promoting inflammation or enhancing T-cell proliferation. Abbr.: IL-1 Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. interleaving interleukin 2 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