[out-wosh, -wawsh]
noun Geology.
the material, chiefly sand or gravel, deposited by meltwater streams in front of a glacier.

1890–95; out- + wash

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World English Dictionary
outwash (ˈaʊtˌwɒʃ)
a mass of gravel, sand, etc, carried and deposited by the water derived from melting glaciers

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Example sentences
Outwash deposits also form a highly irregular and unorganized morphology called
  kame and kettle terrain.
The land surface is a glacial outwash plain underlain by stratified glacial
  outwash deposits.
Outwash deposits are similar to alluvial deposits and are better stratified and
  sorted than the glacial tills.
Little runoff is produced on glacial terraces because of the high permeability
  of outwash deposits.
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