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Wiktionary
headstream

n. A stream that is the source of a river

WordNet
headstream

n. a stream that forms the source of a river

Usage examples of "headstream".

EBOLA VIRUS IS named for the Ebola River, which is the headstream of the Mongala River, a tributary of the Congo, or Zaire, River.

Diamonds have been discovered in the Thika river, one of the headstreams of the Tana.