The character 膈 has the flesh-radical 月 (a body part) plus 鬲 (lì — an ancient cooking tripod), suggesting an organ that 'partitions' the body like a tripod's lid. Note 膈 (gé — diaphragm) and 隔 (gé — to separate) share both pronunciation and the 鬲 component.
usage
More commonly seen in compounds: 横膈膜 (hénggémó — diaphragm membrane), 膈肌 (géjī — diaphragm muscle), 打嗝 (dǎgé — to hiccup, here 嗝 has the mouth radical).
