- ischium, ischial bone, os ischii - one of the three sections of the hipbone; situated below the ilium
--1 is a kind of bone, os
--1 is a part ofhip, hip joint, coxa, articulatio coxae; pelvis, pelvic girdle, pelvic arch, hip
| hip, hip joint, coxa, articulatio coxae; pelvis, pelvic girdle, pelvic arch, hip |