gas and air

English

Noun

gas and air (uncountable)

  2. (medicine, idiomatic) An equal mixture of nitrous oxide and oxygen, used as a mild analgesic and anaesthetic, particularly during childbirth, for dental procedures, and in emergency medicine.
    Meronyms: nitrous oxide, N₂O; oxygen (strict sense), oxygen (loose sense), dioxygen, O₂
    Near-synonym: Entonox (trade name: one particular brand)
  4. Used other than figuratively or idiomatically: see gas,‎ and,‎ air.

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