a pine (Pinus palustris) native to the S U.S., having very long needles and valued for its hard, heavy wood
See longleaf pine in American Heritage Dictionary 4
noun
An evergreen tree (Pinus palustris) of the southeast United States, having long needles and heavy, tough, resinous wood valued as a source of timber, pulp, and turpentine. Also called yellow pine; also called regionally fat pine.