stream-bed

streambed

[streem-bed]
noun
the channel in which a stream flows or formerly flowed.

Origin:
1855–60; stream + bed

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
streambed

noun
a channel occupied (or formerly occupied) by a stream 
WordNet® 3.0, © 2006 by Princeton University.
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