Added 10 October 2026 streamflow noun Categories: Rare Words noun ! Definition from Wiktionary (CC BY-SA). More about streamflow at Wordnik → Where our words come from → The runoff of surface water through a channel. Origin From stream + flow. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: drainagefloodrunoffseepagefluxhydrometricflowairflowoutflowspillagerun-offgauging Back to today's word