WordReference Random House Learner's Dictionary of American English © 2020
ˈgreen•house ˌgas, n. [countable]
  • Meteorologyany of the gases that absorb energy from the sun and so contribute to the greenhouse effect, including carbon dioxide, methane, ozone, and the fluorocarbons.

  • WordReference Random House Unabridged Dictionary of American English © 2020
    greenhouse gas′, 
  • Meteorologyany of the gases whose absorption of solar radiation is responsible for the greenhouse effect, including carbon dioxide, methane, ozone, and the fluorocarbons.
    • 1980–85

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