/ Dictionary / Index I IL-1: Meaning and Definition of Find definitions for: IL-1 Pronunciation: [key] — Immunol. Immunol. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. IL IL-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