os ischii

Từ điển WordNet v3.1 - WordNet Dictionary

noun

one of the three sections of the hipbone;
situated below the ilium
• Syn:
ischium, ischial bone
• Hypernyms:
bone, os
• Part Holonyms:
hip, hip joint, coxa, articulatio coxae, pelvis,
pelvic girdle, pelvic arch