alluvial
C2CEFR level
75/100Rarity: rare
TechnicalRegister
Relating to fine, fertile sediment deposited by flowing water.
The rich alluvial soil of the floodplain yielded abundant crops each year.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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