noun[mass noun] North American
- Slowly moving water in a river, as opposed to rapids.More example sentences
- The narrow vessels are designed to travel extremely fast atop flat water.
- Just now we're sailing along in a stiff breeze over flat water.
- Two days ago, I took my son on a 30 minute flatwater canoe ride.
More definitions of flatwaterDefinition of flatwater in:
- The US English dictionary