alluvion

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun gradual formation of new land, by recession of the sea or deposit of sediment
noun the rising of a body of water and its overflowing onto normally dry land
noun clay or silt or gravel carried by rushing streams and deposited where the stream slows down

Borrowed from Latin alluviō.

On all the streams are strips of rich alluvion of exhaustless fertility. — A New Guide for Emigrants to the West, John Mason Peck
The hoof of my horse no longer sinks in light sand or dark alluvion. — The Rifle Rangers, Mayne Reid
The whole party crowded to the spot where Uncas pointed out the impression of a moccasin in the moist alluvion. — The Last of the Mohicans; A narrative of 1757, James Fenimore Cooper

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