/ Dictionary / Index B backplate: Meaning and Definition of Find definitions for: back•plate Pronunciation: (bak'plāt"), [key] — n. a wood or metal plate serving as a backing for a structural member. a piece of plate armor for protecting the back: worn as part of a cuirass. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: backplate (Thesaurus) back plastering back projection Related Content Daily Word Quiz: diaphanous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language