一氧化二氮
yī​yǎng​huà'èr​dàn

nitrous oxide

  1. 一 yī numeral
    one
    one; the number 1; single; alone
  2. 氧化 yǎng​huà noun
    oxidize; oxidation
    to combine with oxygen; the chemical process of losing electrons (as in rusting or combustion)
  3. 二 èr numeral
    two
    the number two; 2
  4. 氮 dàn noun
    nitrogen
    the nonmetallic chemical element with symbol N; a colorless, odorless gas that makes up about four-fifths of the earth's atmosphere