一氧化氮 Traditional form: 一氧化氮 Pinyin (reading): yīyǎnghuàdàn Definitions: nitric oxide Characters: 一 - one; a, an; alone 氧 - oxygen 化 - to change, to convert, to reform; -ize 氮 - nitrogen Traditional characters: 一 - one; a, an; alone 氧 - oxygen 化 - to change, to convert, to reform; -ize 氮 - nitrogen