/ Dictionary / Index L Leinster: Meaning and Definition of Find definitions for: Lein•ster Pronunciation: (len'stur), [key] — n. a province in the E Republic of Ireland. 1,788,844; 7576 sq. mi. (19,620 sq. km). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Leinsdorf leiomyoma Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language