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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.
Then there are the few that can transport to a different space entirely, evoking everything from polished hotel lobbies to lush rainforests, hidden gardens, and even smoky campfires. Alexandra Ditch, Vogue, 7 Dec. 2025 To develop the light-absorbing fabric, researchers took inspiration from the extraordinarily black feathers of a tropical bird-of-paradise—Ptiloris magnificus, the 'magnificent riflebird'—which lives in the rainforests of Papua New Guinea and Australia's Cape York Peninsula. Maria Azzurra Volpe, MSNBC Newsweek, 2 Dec. 2025 But many houseplants hail from steamy rainforests where humidity levels are always high. Lauren Landers, Better Homes & Gardens, 2 Dec. 2025 The warm paradise is known for its beaches, rainforests, wildlife and adventure activities. Ashley J. Dimella, FOXNews.com, 1 Dec. 2025 The Pacific Side of Costa Rica Here, the rainforest meets the sea in a dramatic fashion. Geoffrey Ravoire, Travel + Leisure, 29 Nov. 2025 On the fossil fuel front, its phase-out roadmap continued to grow in the heart of the Amazon rainforest, with more than 80 countries—across Africa, Asia, Latin America, the Pacific and Europe—already onboard, according to the Global Gas & Oil Network (GGON). Alexandra Harrell, Sourcing Journal, 26 Nov. 2025 The interconnected climate systems of the Greenland ice sheet, the Atlantic meridional overturning circulation, the Amazon rainforest, and the South American monsoon are destabilizing. Rafil Kroll-Zaidi, Harpers Magazine, 23 Nov. 2025 The film explores a strange colonial scheme in the 20th century when automaker Henry Ford attempted to create a rubber plantation in the Amazon rainforest of Brazil. Matthew Carey, Deadline, 16 Nov. 2025

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 8 Dec. 2025.

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

More from Merriam-Webster on rainforest

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