Added 10 October 2026 kneejoint noun Categories: Obscure Words noun ! Definition from Wiktionary (CC BY-SA). More about kneejoint at Wordnik → Where our words come from → The joint of the knee. A toggle joint; so called because it consists of two pieces jointed to each other end to end, making an angle like the knee when bent. Origin From knee + joint. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: kneekneecappatellajointanklegenufemorotibialisrotulathigh Back to today's word