/ Dictionary / Index B breechblock: Meaning and Definition of Find definitions for: breech•block Pronunciation: (brēch'blok"), [key] — n. Ordn. a movable piece of metal for closing the breech in certain firearms. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: breechblock (Thesaurus) breech birth breechcloth Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language