/ Dictionary / Index S sustained-release: Meaning and Definition of Find definitions for: sus•tained-re•lease Pronunciation: (su-stānd'ri-lēs'), [key] — adj. Chem., Pharm. (of a drug or fertilizer) capable of gradual release of an active agent over a period of time, allowing for a sustained effect; timed-release; long-acting; prolonged-action; slow-release. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sustain sustainer Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language