loess, an unstratified, geologically recent deposit of silty or loamy material that is usually buff or yellowish brown in colour and is chiefly deposited by the wind.Loess is a sedimentary deposit composed largely of silt-size grains that are loosely cemented by calcium carbonate.It is usually homogeneous and highly porous and is traversed by vertical …

The meaning of LOESS is an unstratified usually buff to yellowish brown loamy deposit found in North America, Europe, and Asia and believed to be chiefly deposited by the wind.