Definition of prairie soil in English:

prairie soil

noun

  • Soil of the kind characteristic of the North American prairies; (specifically in Soil Science) a soil that is marked by a deep, dark-coloured surface horizon with a high organic content, is subject to moderate leaching, and occurs under long grass in subhumid temperate regions.

Origin

Early 19th century; earliest use found in Samuel R. Brown (1775–1817).