Late 18th century; earliest use found in Richard Sulivan (1752–1806), writer. From alluvium or its etymon post-classical Latin alluvium + -an, perhaps after French alluvien.
Definition of alluvian in US English:
alluvian
adjectiveəˈl(j)uːvɪən
Alluvial.
Origin
Late 18th century; earliest use found in Richard Sulivan (1752–1806), writer. From alluvium or its etymon post-classical Latin alluvium + -an, perhaps after French alluvien.