/ Dictionary / Index R restrainer: Meaning and Definition of Find definitions for: re•strain•er Pronunciation: (ri-strā'nur), [key] — n. a person or thing that restrains. a chemical added to a developer to retard its action. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: restrainer (Thesaurus) restrained restraining order Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language