streambed

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

Origin:
1855–60; stream + bed

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The bottom of the pole rests on the streambed, and markings along its length
  reveal the water's depth.
The fossil was found during road construction that revealed an ancient
  streambed.
If there were any hands raised, teach them that stream flow is entirely
  dependent upon the gradient of the streambed.
On benches above the streambed, yellow and pink blooms of prickly pear cactus
  herald the spring.
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