grassland prairie An area of land of low topographic relief that historically supported grasses and herbs, with few trees, and having generally a mesic (moderate or temperate) climate. Dominated by tall grasses (contrast steppe). ENVO ENVO:00000260 FTT:259 FTT:707 FTT:769 FTT:926 TGN:21605 TGN:21606 Wikipedia:Prairie grassland llanos pampa plain veld