氧化钙 Traditional form: 氧化鈣 Pinyin (reading): yǎnghuàgài Definitions: calcium oxide, CaO (slang) (used as a substitute for 肏 (cào), since CaO resembles cào) Characters: 氧 - oxygen 化 - to change, to convert, to reform; -ize 钙 - calcium Traditional characters: 氧 - oxygen 化 - to change, to convert, to reform; -ize 鈣 - calcium