下颌骨 Traditional form: 下頜骨 Pinyin (reading): xiàhégǔ Definitions: lower jaw mandible Characters: 下 - below, underneath; inferior; to bring down; next 颌 - mouth; jaw 骨 - bone; skeleton; frame, framework Traditional characters: 下 - below, underneath; inferior; to bring down; next 頜 - mouth; jaw 骨 - bone; skeleton; frame, framework