牙周炎 Save Sign in to save words yázhōuyán ㄧㄚˊ ㄓㄡ ㄧㄢˊ periodontitis (gum disorder) Character by character 牙(yá)tooth 周(zhōu)surname Zhou 炎(yán)flame A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0