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

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Examples of greenhouse in a Sentence

Noun needed to move the plants into the greenhouse before the first frost killed them
Recent Examples on the Web: Noun Supporters say the project would reduce greenhouse emissions and stabilize energy costs in the region., "Hotel chain grows by more than 900 properties," 31 Dec. 2020 Arizona was once a leader in efforts to reduce greenhouse emissions., "The biggest Arizona headlines of 2020, from COVID-19 to the elections," 28 Dec. 2020 The California air agency has often set the tone nationally on policies to curb greenhouse gas emissions. Abby Smith, Washington Examiner, "Daily on Energy, presented by API: Kerry spells out climate diplomacy aims," 10 Dec. 2020 To reach that goal, greenhouse emissions need to drop dramatically and soon. Ivana Kottasová, CNN, "Heat-trapping gas levels reach a new record high, despite the coronavirus lockdown," 23 Nov. 2020 When President Barack Obama signed the deal five years ago, the U.S. pledged to curb greenhouse gas emissions by 26% to 28% below 2005 levels by 2025. Jess Shankleman,, "U.S. Exits Paris Climate Pact With Election Outcome Uncertain," 4 Nov. 2020 Its supporters argue saving the system keeps cars off the road and reduces greenhouse gas emissions. Mallory Moench,, "Measure RR: Caltrain winning bid for crucial tax increase," 4 Nov. 2020 That leaves up for debate whether the report was able to anticipate Measure E’s impacts on environmental factors such as greenhouse gas emissions, traffic and air quality. Jennifer Van Grove, San Diego Union-Tribune, "The battle over Midway District building heights may be decided in court," 4 Nov. 2020 And last month, revising its somewhat hedged policy on climate change, the Roundtable threw its support behind putting a price on carbon to reduce greenhouse gas emissions by 80 percent by 2050. Washington Post, "The right formula for managing a socially responsible company? There is none.," 5 Oct. 2020 Recent Examples on the Web: Adjective And there are other ways for the president to crack down on emissions, including tightening regulations on non-greenhouse coal-plant pollutants and vehicle fuel economy standards, and boosting support for renewables. Tim Mcdonnell, Quartz, "RBG’s replacement could undermine the most important climate ruling," 22 Sep. 2020 The emissions impact of millions of people not commuting by car every day are enormous No single activity contributes more greenhouse gas emissions than driving to and from work. Matt Butner, Quartz at Work, "Remote work is a huge opportunity for high-impact climate policy," 5 May 2020 Ideally, the new project would generate less greenhouse gas emissions than are being created at the Coliseum. Phil Matier,, "AC Transit passengers get free ride throughout pandemic," 25 Mar. 2020 The change is also expected to result in significantly more greenhouse gas emissions, which trap the sun’s heat, worsening the effects of climate change. Los Angeles Times, "Trump weakens fuel economy standards, rolling back key U.S. effort against climate change," 31 Mar. 2020 Of the 90 countries whose oil extraction was studied, few generated more greenhouse gas per barrel. Christopher Flavelle, New York Times, "Global Financial Giants Swear Off Funding an Especially Dirty Fuel," 12 Feb. 2020 The thawing of permafrost represents a positive feedback that amplifies warming by releasing more greenhouse gas into the atmosphere. Scott K. Johnson, Ars Technica, "New estimate of how much thawing permafrost will worsen warming," 6 Feb. 2020 Increasing fuel efficiency means vehicles burn less gas and subsequently emit less greenhouse gas pollution into the atmosphere. New York Times, "Automakers, Rejecting Trump Pollution Rule, Strike a Deal With California," 25 July 2019 The surface is inhospitable due to the planet’s runaway greenhouse gas atmosphere and often reaches temperatures of up to 900 degrees Fahrenheit. Jennifer Leman, Popular Mechanics, "Looks Like Venus Was Volcanically Active All Along," 3 Jan. 2020

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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Time Traveler for greenhouse

Time Traveler

The first known use of greenhouse was in 1664

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Statistics for greenhouse

Last Updated

24 Jan 2021

Cite this Entry

“Greenhouse.” Dictionary, Merriam-Webster, Accessed 28 Jan. 2021.

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More Definitions for greenhouse


How to pronounce greenhouse (audio)

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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