noun
- a stream that is the source or beginning of a river
Examples
- The headstream of the Mississippi River begins in northern Minnesota.
- Geologists traced the headstream to a small spring in the mountains.
- The headstream was barely a trickle during the dry season.
- Multiple headstreams converge to form the main river.
- The expedition followed the headstream to its origin.
- Pollution in the headstream affects the entire river system.