loess
Concise Oxford English Dictionary © 2008 Oxford University Press:
loess /ˈləʊɪs, ləːs/
▶noun Geology a loosely compacted yellowish-grey deposit of wind-blown sediment.
– derivatives
loessial adjective,
loessic adjective.
loessial adjective,
loessic adjective.
– origin C19: from Ger. Löss, from Swiss Ger. lösch ‘loose’.
'loess' also found in these Oxford entries:

