greenhouse gas
noun
Definition of greenhouse gas
: any of various gaseous compounds (such as carbon dioxide) that absorb infrared radiation, trap heat in the atmosphere, and contribute to the greenhouse effect
From the M-W Editors
There's more!
Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
1975
First Known Use of greenhouse gas
1975
Seen and Heard
What made you want to look up greenhouse gas? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!