Left ⺼ is the meat-flesh radical — visually identical to
月 'moon' but a separate component, the side-form of
肉. Indexes
膘 with the body / anatomy family (
脏 organs,
脚 foot,
胸 chest,
肠 intestine). Carries the core meaning:
膘 names the layer of fat on a livestock animal's body, the visible measure of its condition.