stream·bed 
(strēmbĕd′)
(strēmbĕd′)n.
The channel through which a natural stream of water runs or used to run.
- sidereal
- sidereal day
- sidereal hour
- sidereal month
- sidereal time
- sidereal year
- siderite
- sideritic
- SI-derived unit
- sidero-
- siderochrome
- siderocyte
- siderophile
- siderosis
- sidesaddle
- sideshow
- sideslip
- sidespin
- sidesplitter
- sidesplitting
- sidesplittingly
- sidestep
- sidestepper
- side-straddle hop
- sidestream smoke