Kneecap/ˈniːkæp/ Definition 1 of 2Pro Tip 1/3Anatomical Term Kneecap is a specific bone, used when discussing the body or injuries. The x-ray showed her kneecap was intact after the fall. Pro Tip 2/3Injury Context Common in sports or accident situations, 'kneecap' signals a focus on the injury. The football player couldn't continue after his kneecap injury. Pro Tip 3/3Medical Vocabulary 'Kneecap' is often used by medical professionals when explaining conditions. Your swollen kneecap requires icing and rest.