inflammable air

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inflammable air (uncountable)

  1. (chemistry, now historical) Hydrogen.
    • 1791, Erasmus Darwin, The Economy of Vegetation, J. Johnson, p. 11:
      Mr. Cavendish has shewn, that the gas called inflammable air, is at least ten times lighter than common air; Mr. Lavoisier contends, that it is one of the component parts of water, and is by him called hydrogene.