牙关 Traditional form: 牙關 Pinyin (reading): yáguān Definitions: jaw mandibular joint Characters: 牙 - tooth, molar; fang, tusk; serrated 关 - frontier pass; to close, to shut; relation Traditional characters: 牙 - tooth, molar; fang, tusk; serrated 關 - frontier pass; to close, to shut; relation