/ Dictionary / Index I interleukin 3: Meaning and Definition of Find definitions for: interleukin 3 Pronunciation: [key] — Immunol. Immunol. a lymphokine protein, secreted by T cells, that participates in the regulation of blood-cell production. Abbr.: IL-3 Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. interleukin 2 interlibrary loan 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