river-bed

riv·er·bed

[riv-er-bed]
noun
the channel in which a river flows or formerly flowed.

Origin:
1825–35; river1 + bed

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
riverbed

noun
a channel occupied (or formerly occupied) by a river 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
River-bed is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
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