loess
/'louis, lə:s/
Definition
Noun: A fine-grained, unstratified (not arranged in layers), porous, yellowish-brown deposit of windblown silt and clay. It is typically geologically young and forms fertile soil in many regions.
Usage
Loess is a technical geological term. It is used as a mass noun (uncountable) to describe the sediment itself or the landform composed of it. - The loess deposits in China are some of the thickest in the world. - The Mississippi River valley has extensive loess bluffs. - Farmers value the fertile soil derived from loess.
Advanced Usage
- Loess Plateau: A specific, large geographical region in north-central China characterized by deep loess deposits.
- The Loess Plateau is known for its severe soil erosion.
- Loessial (adjective): Pertaining to or consisting of loess.
- The loessial soils are highly productive for agriculture.
Variants and Related Words
- Loessic (adjective): An alternative adjective form meaning 'of or relating to loess'.
- Loessland: Land characterized by loess deposits.
Synonyms
- Silt (though silt is a general particle size category, not specifically wind-deposited).
- Aeolian deposit (a broader term for any material deposited by wind).
Different Meanings
The word loess has a single, specific geological meaning and is not commonly used in other contexts.
Noun
-
a fine-grained unstratified accumulation of clay and silt deposited by the wind
