Added 9 October 2026 fibreboard noun Categories: ThingsObscure Words noun ! Definition from WordNet 3.1, Princeton University. More about fibreboard at Wordnik → Where our words come from → Wallboard composed of wood chips or shavings bonded together with resin and compressed into rigid sheets. Origin From fibre + board. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: fiberboardcardboardpaperboardcartonpaperboxfiberflaggedbunchcorrugatedinset Back to today's word