[ streem-bed ]
/ ˈstrimˌbɛd /
the channel in which a stream flows or formerly flowed.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for streambed
Morning dawned gloomily; there was a light mist hanging over the streambed, and much of the sky was turgid with clouds.Attrition|Jim Wannamaker