green·​house | \ ˈgrēn-ˌhau̇s How to pronounce greenhouse (audio) \

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

Essentially miniature greenhouses, these glass containers filled with florals make a whimsical addition to any home. Taysha Murtaugh, Country Living, "20 Best Terrarium Plants for Every Type of Home," 4 Jan. 2019 Sunrise Lane also includes a carriage house and greenhouse on the property, all listed for $560,000. Megan Barber, Curbed, "Frank Lloyd Wright-inspired ‘parallelogram’ house asks $560K," 3 Dec. 2018 Betty later finds out from her coroner pal Dr. Curdle Jr. that Daryl did not commit suicide, but was poisoned with a herb that grows in Penelope Blossom’s greenhouse. Emma Dibdin, Harper's BAZAAR, "Riverdale Has Some Very Bad News for Varchie Fans," 29 Nov. 2018 There’s a third model — mixed-light or greenhouse growing — which has a little bit of the pros and cons of indoor and outdoor. Angela Chen, The Verge, "Why the future of marijuana farming could be craft weed," 21 Nov. 2018 Fossil fuel combustion is America's biggest source of greenhouse gases (GHGs). David Grossman, Popular Mechanics, "New Green Deal, Explaind: What's Actually in the Alexandria Ocasio-Cortez Energy Plan?," 8 Feb. 2019 Additionally, the department will have a new office on climate policy that will seek ways to reduce emissions of greenhouse gases and promote renewable energy while helping Michigan adjust to a warmer world. John Flesher, The Seattle Times, "Michigan governor revamps environmental agency after Flint," 4 Feb. 2019 And also on a global one: In October, the UN's Intergovernmental Panel on Climate Change (IPCC) said eating less meat reduces greenhouse gasses and prevent deforestation. Elise Taylor, Vogue, "Beyoncé and Jay Z Want You to Join the Vegan Movement," 31 Jan. 2019 And the business case for cutting greenhouse gases got stronger. Umair Irfan, Vox, "Climate and energy news in 2018 actually wasn’t all bad," 1 Jan. 2019

Recent Examples on the Web: Adjective

This fuel emits less greenhouse gas than coal when burned but is still a major contributor overall. Chris Mooney, The Seattle Times, "U.S. greenhouse gas emissions spiked in 2018 – and it couldn’t happen at a worse time," 9 Jan. 2019 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

15 Mar 2019

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Time Traveler for greenhouse

The first known use of greenhouse was in 1664

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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 How to pronounce greenhouse (audio) \

Kids Definition of greenhouse

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

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