noun. one of the three sections of the hipbone; situated below the ilium.
- pelvic girdle
- os ischii
- hip joint
- articulatio coxae
- pelvic arch
Example sentences of the word ischium
1. Noun, singular or mass
It runs forward from the front of the sacrum and downward to attach to the tubercle of the ischium, a bony prominence on one of the bones that make up the ring of the pelvis.