Breadcrumb Home > Dictionary > Index D detainer: Meaning and Definition of Find definitions for: de•tain•er Pronunciation: (di-tā'nur), [key] — n. Law. a writ for the further detention of a person already in custody. the wrongful detaining or withholding of what belongs to another. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. detainee detect ✖ Related Content Daily Word Quiz: acronym Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language