/ Dictionary / Index J jambstone: Meaning and Definition of Find definitions for: jamb•stone Pronunciation: ( jam'stōn"), [key] — n. Masonry. a stone, or one of the stones, forming one jamb of an opening. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. jambos James 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