/ Dictionary / Index L longleaf pine: Meaning and Definition of Find definitions for: long'leaf pine' Pronunciation: (lông'lēf", long'-), [key] an American pine, Pinus palustris, valued as a source of turpentine and for its timber. the wood of this tree. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. long-lasting longliner Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language