This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of, relating to, or found in alluvium: alluvial soil; alluvial gold.

adj. Pertaining to the soil deposited by a stream.

n. A deposition of sediment over a long period of time by a river; an alluvial layer.

n. Alluvial soil; specif., in Australia, gold-bearing alluvial soil.

adj. Pertaining to, contained in, or composed of, alluvium; relating to the deposits made by flowing water; washed away from one place and deposited in another.

Of, pertaining to, or composed of alluvium: as, alluvial deposits; alluvial soil.

A term applied to the most recent or postglacial deposits, which follow the diluvial deposits.

n. Alluvial soil; specifically, in Australia and New Zealand, gold-bearing alluvial soil.

adj. of or relating to alluvium

"Diamonds occur in alluvial lands mostly open and comparatively level, as in India, the Brazil and the Cape."

alluvial formations    alluvial cone    alluvial fan    deltaic   

alluvium   

alluvial fan    alluvially    alluvial plain   

fluvial   

fluvial    pluvial   

marshy    pebbly    clayey    well-watered    sandy    calcareous    well-cultivated    arable    hilly    fertile