'Loess' definitions:

Definition of 'loess'

(from WordNet)
noun
A fine-grained unstratified accumulation of clay and silt deposited by the wind

Definition of 'Loess'

From: GCIDE
  • Loess \Loess\ (l[~e]e), n. [G. l["o]ss.] (Geol.) A quaternary deposit, usually consisting of a fine yellowish earth, on the banks of the Rhine and other large rivers. [1913 Webster]