noun
ischium; ischial bone
Anatomical term for the lower and back part of the hip bone. Used in medical and biological contexts.
坐骨は骨盤の一部を構成する骨です。
The ischium is a bone that forms part of the pelvis.
長時間座っていると坐骨に痛みを感じることがあります。
Sitting for long periods can sometimes cause pain in the ischial bones.
From 坐 (za, 'sit') + 骨 (kotsu, 'bone'), referring to the bone that bears weight when sitting. The variant 座骨 uses the modern form of the same character.