Alluvial deposit – Definition & Meaning

Alluvial deposits are one of the most important geological phenomena that have shaped the Earth’s surface for millions of years. These deposits are formed by the accumulation of sediments, minerals, and organic matter carried by water, wind, or ice. In this article, we will discuss the definition, origin, meaning, associations, synonyms, antonyms, and example sentences related to alluvial deposits.


Alluvial deposit is defined as a deposit of sediment, mineral, or organic matter that has been transported and deposited by flowing water. These deposits can be found in rivers, streams, lakes, and oceans. The term “alluvial” is derived from the Latin word “alluvium,” which means “to wash against.”


Alluvial deposits are formed by the erosion of rocks and soil by water, wind, or ice. The sediments, minerals, and organic matter are carried by the flowing water or wind and deposited in low-lying areas such as riverbeds, floodplains, and deltas. Over time, these deposits can accumulate and form layers of sedimentary rock.

Meaning in different dictionaries

According to the Merriam-Webster dictionary, alluvial deposit is “a deposit of clay, silt, sand, gravel, or other particulate material that has been deposited by a stream or other body of running water and is sorted and deposited by size and weight.” The Oxford dictionary defines it as “a deposit of sand, mud, etc., formed by flowing water.”


Alluvial deposits are associated with various geological processes such as erosion, sedimentation, and deposition. They are also associated with the formation of mineral deposits such as gold, diamonds, and platinum. Alluvial deposits are important sources of groundwater and provide habitats for aquatic and terrestrial plants and animals.


Some synonyms of alluvial deposit include sediment, silt, sand, gravel, clay, and mud.


There are no specific antonyms for alluvial deposit, but some opposite terms may include rock, mountain, and hill.

The same root words

The root word of alluvial deposit is “alluvium,” which means “to wash against.” Other words that share the same root include alluvion, alluvial fan, and alluvium soil.

Example Sentences

  1. The gold rush in California was fueled by the discovery of alluvial deposits in the rivers.
  2. The alluvial deposit in the riverbed provided fertile soil for farming.
  3. The alluvial fan at the base of the mountain was formed by the erosion of rocks and soil.
  4. The alluvial clay was used to make pottery by the indigenous people.
  5. The alluvial sediment in the lake provided a habitat for aquatic plants and animals.
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