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headstream

[hed-streem]
noun
  1. a stream that is the source, or one of the sources, of a river.
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Origin of headstream

First recorded in 1810–20; head + stream
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for headstream

headstream

noun
  1. a stream that is the source or a source of a river
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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