Added 9 October 2026 fountainhead noun Categories: LanguagePlacesRare Words noun ! Definition from Wiktionary (CC BY-SA). More about fountainhead at Wordnik → Where our words come from → A spring that is the source of a river. An abundant source of knowledge, etc. Origin From fountain + head. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: headspringwellspringheadwellsourcefountainfontfountfreshetfountainwaterfountlet Back to today's word