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[out-wosh, -wawsh] /ˈaʊtˌwɒʃ, -ˌwɔʃ/
noun, Geology
the material, chiefly sand or gravel, deposited by meltwater streams in front of a glacier.
1890-95; out- + wash Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for outwash
  • 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.
  • Jack pine forests grew on extensive outwash plains, along with red pine-white pine forests where fires were less severe.
  • The sands of the outwash plain are excessively drained.
  • Jack pine remains on the outwash plains along with northern pin oak.
  • The fluvial valley contains several glacial outwash terraces, and the current active river channel and its adjacent floodplain.
  • It is known for its pitted outwash plains and kettle lakes mixed with extensive forests and large peatlands.
  • Streams may lose water through alluvial fans to impart additional recharge to the outwash aquifer in the valley.
British Dictionary definitions for outwash


a mass of gravel, sand, etc, carried and deposited by the water derived from melting glaciers
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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