/ Dictionary / Index B ball-peen hammer: Meaning and Definition of Find definitions for: ball'-peen ham"mer Pronunciation: (bôl'pēn"), [key] a hammer having a hemispherical peenfor beating metal. See illus. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ballpark ballplayer Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language