|1.||a. a compact brownish deposit of partially decomposed vegetable matter saturated with water: found in uplands and bogs in temperate and cold regions and used as a fuel (when dried) and as a fertilizer|
|b. (as modifier): peat bog|
|2.||a piece of dried peat for use as fuel|
|[C14: from Anglo-Latin peta, perhaps from Celtic; compare Welsh peth thing]|
Partially decayed vegetable matter, especially peat moss, found in bogs. The low levels of oxygen and the acidic environment in bogs prevent the degradation of peat. Peat is burned as fuel and also used as fertilizer. See more at bog.