Entry 1 sense Webster, 1913 Ischiocapsular · Is·chi·o·cap·su·lar · IPA 01 a. Of or pertaining to the ischium and the capsule of the hip joint; as, the ischiocapsular ligament. 1. Of or pertaining to the ischium and the capsule of the hip joint; as, the ischiocapsular ligament.(Anat.)