Definition of alluvium in US English:

alluvium

noun

  • A deposit of clay, silt, sand, and gravel left by flowing streams in a river valley or delta, typically producing fertile soil.

    • ‘Some of these low-lying areas, with waterlogged deposits blanketed by alluvium, have provided good evidence for Roman farming.’
    • ‘The upper region of the Camargue, blessed with rich alluvium soil, has been cultivated since the Middle Ages.’
    • ‘In the east, which is lower and flatter, river gravels and alluvium from the North Sea have produced dark, rich soils.’
    • ‘Many vineyards are located on valley bottoms underlain by alluvium which can provide deep, free-draining soils of variable grain size.’
    • ‘The measured soil parameters at the sites were within the normal range for bottomland hardwood soils of Mississippi River alluvium.’
    mud, muck, mire, ooze, silt, dirt, slime, slush, slurry
    View synonyms

Origin

Mid 17th century: Latin, neuter of alluvius ‘washed against’, from ad- ‘towards’ + luere ‘to wash’.

Pronunciation

alluvium

/əˈluviəm//əˈlo͞ovēəm/