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腘 is a phono-semantic compound, with its traditional form 膕. The left side, the flesh radical 月, indicates it belongs to the category of body parts. The right side, 国 (traditionally 國), provides the phonetic element. The character specifically denotes the popliteal fossa, the hollow behind the knee. It has maintained this precise anatomical meaning throughout its history without developing metaphorical uses, making it a specialized term found mainly in medical and kinesiological contexts.