溶洞 Save Sign in to save words róngdòng ㄖㄨㄥˊ ㄉㄨㄥˋ solutional cave (typically, a limestone cave) geology Character by character 溶(róng)dissolve 洞(dòng)cave A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0