<p><strong>Noun</strong></p><ul><li>an extensive, level or slightly undulating, mostly treeless tract of land in the Mississippi valley, characterized by highly fertile soil and originally covered with coarse grasses, merging into drier plateaus in the west.</li><li>Compare: pampas, savanna, steppe.</li><li>a tract of grassland; meadow.</li><li>(in Florida) a low, sandy tract of grassland often covered with water.</li><li>Southern U.S. wet grassland; marsh.</li><li>(initial capital letter) a steam locomotive having a two-wheeled front truck, six driving wheels, and a two-wheeled rear truck.</li></ul>