one of the 12 soil orders in the U.S. Soil Taxonomy. Histosols are formed under waterlogged conditions typical of peat bogs, moors, and swamps. Under ... [2 related articles]one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO). Histosols are low-density, acidic soils with a ...
Wet organic soils, such as peats and mucks.
Wet organic soils, such as peats and mucks. 
a worldwide soil type rich in organic matter, as peat, esp. prevalent in wet, poorly drained areas.