green·​house | \ˈgrēn-ˌhau̇s \

Definition of greenhouse 

(Entry 1 of 2)

1 : a structure enclosed (as by glass) and used for the cultivation or protection of tender plants

2 : a clear plastic shell (such as a canopy) covering a section of an airplane also : a compartment (as for a bombardier) enclosed by such a shell



Definition of greenhouse (Entry 2 of 2)

: of, relating to, contributing to, or caused by the greenhouse effect greenhouse warming greenhouse gases

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Synonyms for greenhouse

Synonyms: Noun

conservatory, glasshouse [chiefly British], hothouse

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Examples of greenhouse in a Sentence


needed to move the plants into the greenhouse before the first frost killed them

Recent Examples on the Web: Noun

And Grisham advocated new rules to regulate methane, a potent greenhouse gas, and has a long voting record in the House as a representative of New Mexico in favor of bills to address climate change. Umair Irfan, Vox, "Governors could drive the next wave of climate change action," 8 Nov. 2018 Precisely how much methane (a greenhouse gas) leaks is important—leak enough and natural gas isn’t actually better than coal. Scott K. Johnson, Ars Technica, "How leaky is natural gas production? One puzzle solved," 2 Nov. 2018 With depressingly ironic timing, the Trump administration announced Tuesday a plan to roll back federal rules on methane, a potent greenhouse gas that is the main component in natural gas. Brian Flood, Fox News, "Hurricane Florence: Washington Post declares Trump is 'complicit' for dangerous storm," 12 Sep. 2018 Moreover, the team also found that this abrupt thawing was still a concern even under a scenario in which humans tried to rein in their greenhouse-gas production and slow climate change. Meghan Bartels,, "Melting Permafrost Below Arctic Lakes Is Even More Dangerous to the Climate, NASA Warns," 18 Aug. 2018 Has Lee Chang-dong ever indicated why Burning focuses on greenhouse arson instead of barns? Tasha Robinson, The Verge, "Steven Yeun on Burning, The Walking Dead, and changing roles for Asian-Americans," 4 Nov. 2018 What does that mean, since no local greenhouses have gone up in flames? Joe Morgenstern, WSJ, "‘Burning’ Review: Up in Smoke," 1 Nov. 2018 For example, while greenhouse warming generally causes an increase in global precipitation, cooling the planet in this way would cause an even stronger precipitation decrease that more than cancels that out. Scott K. Johnson, Ars Technica, "Geoengineering could stop warming but comes with side of sea-level rise," 31 Oct. 2018 Florida is basically a greenhouse full of alligators and invasive Burmese pythons. Jacqueline Detwiler, Popular Mechanics, "Tis the Season To Get Yourself a Lightbox," 24 Oct. 2018

Recent Examples on the Web: Adjective

After all, leakage is a lose-lose: companies lose revenue and the atmosphere sees more greenhouse gas that didn’t even do anything for us along the way. Scott K. Johnson, Ars Technica, "How leaky is natural gas production? One puzzle solved," 2 Nov. 2018 In the case of Harvey, as with other specific events, scientists now have the capability to perform attribution studies which make more quantitative statements about how greenhouse gas emissions influenced that event. Suzana Camargo, Fortune, "Global Warming Didn’t Cause Hurricane Harvey. Here’s What Did.," 29 Aug. 2017 The worse mileage a vehicle gets the more greenhouse gas emissions flow into our atmosphere. Gary Richards, The Mercury News, "Mr. Roadshow: Why is she bragging about her polluting old car?," 6 Mar. 2017 Several independent analyses, including authoritative studies from the Department of Energy’s Argonne National Laboratory in Illinois, suggest that ethanol releases significantly less greenhouse gas emissions than gasoline. David Gelles, New York Times, "The Standoff Between Big Oil and Big Corn," 17 Sep. 2016 The school was able to cheaply heat its greenhouse year-round with cord wood cut by students., "New Alaska Handbook Provides How-to on Heated Greenhouses," 12 May 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'greenhouse.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of greenhouse


1664, in the meaning defined at sense 1


1974, in the meaning defined above

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Last Updated

6 Dec 2018

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Time Traveler for greenhouse

The first known use of greenhouse was in 1664

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More Definitions for greenhouse



English Language Learners Definition of greenhouse

 (Entry 1 of 2)

: a building or part of a building that has glass walls and a glass roof and that is used for growing plants



English Language Learners Definition of greenhouse (Entry 2 of 2)

: relating to or caused by the warming of the Earth's atmosphere that is caused by air pollution : relating to or caused by the greenhouse effect


green·​house | \ˈgrēn-ˌhau̇s \

Kids Definition of greenhouse

: a building with clear walls and roof (as of glass) for growing plants

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Comments on greenhouse

What made you want to look up greenhouse? Please tell us where you read or heard it (including the quote, if possible).


the figure or shape of a crescent moon

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