[ suh-steynd-ri-lees ]
/ səˈsteɪnd rɪˈlis /

adjective Chemistry, Pharmacology.

(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.

Origin of sustained-release

First recorded in 1955–60 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019