rainforest

noun

rain·​for·​est ˈrān-ˌfȯr-əst How to pronounce rainforest (audio)
-ˌfär-
variants or less commonly rain forest
plural rainforests also rain forests
1
: a tropical woodland with an annual rainfall of at least 100 inches (254 centimeters) and marked by lofty broad-leaved evergreen trees forming a continuous canopy

called also tropical rainforest

2

Examples of rainforest in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Kids who loved CoComelon will enjoy accompanying Dora on her adventures through the rainforest. Kara Nesvig, Parents, 12 Apr. 2026 The Cleveland Botanical Garden's Glasshouse spotlights plants, insects, birds, and more from the spiny desert of Madagascar and the rainforest of Costa Rica. Ashlyn Ware, Midwest Living, 9 Apr. 2026 One of such projects is the Ferrograo railway project, which would transport commodities including corn and soybeans nearly 1,000 kilometers (621 miles) across the Amazon rainforest. ABC News, 8 Apr. 2026 On a recent morning, Reginaldo Nunes Fonseca smoked cigarettes from the porch of his friend’s wooden shack, watching the rain come down hard in an area now known as Nova Conquista — New Conquest — where pristine rainforest in Brazil’s Amazon stood a year ago. Gabriela Sá Pessoa, Los Angeles Times, 8 Apr. 2026 Other areas prone to drought during El Niño include northern sections of South America (including parts of the Amazon rainforest), central and southern Africa and India. Andrew Freedman, CNN Money, 7 Apr. 2026 Northern permafrost, including in the Alaskan tundra, locks roughly 1 trillion metric tons of carbon in its top three meters of soil — about 10 times the amount of carbon in the entire Amazon rainforest, above and below the surface. Quanta Magazine, 6 Apr. 2026 Indeed, the long tentacles of climate change now extend all the way into the dreary lives of dung beetles in the Amazon rainforest, a new study suggests. Doyle Rice, USA Today, 5 Apr. 2026 Deserts receive little rain; however, rainforests receive vast amounts by comparison. Encyclopedia Britannica, 2 Apr. 2026

Word History

First Known Use

1900, in the meaning defined at sense 1

Time Traveler
The first known use of rainforest was in 1900

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Cite this Entry

“Rainforest.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rainforest. Accessed 15 Apr. 2026.

Kids Definition

rain forest

noun
1
: an often tropical woodland with a high annual rainfall and very tall evergreen trees with tops forming a continuous layer

called also tropical rain forest

2

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