Added 9 October 2026 silkgrass noun Categories: PlantsObscure Words noun ! Definition from WordNet 3.1, Princeton University. More about silkgrass at Wordnik → Where our words come from → Valuable forage grass of dry upland areas and plains of western North America to northern Mexico. Origin From silk + grass. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: beargrasssoapweedyuccasilvergrassdatilsilkyscale Back to today's word