rainforest

American  

[reyn-fawr-ist, ‐-for‐] / ˈreɪnˌfɔr ɪst, ‐ˌfɒr‐ /

Or rain forest

noun

1. a tropical forest, usually of tall, densely growing, broad-leaved evergreen trees in an area of high annual rainfall.

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rainforest British  

/ ˈreɪnˌfɒrɪst /

noun

1. Also called: selva.  dense forest found in tropical areas of heavy rainfall. The trees are broad-leaved and evergreen, and the vegetation tends to grow in three layers (undergrowth, intermediate trees and shrubs, and very tall trees, which form a canopy)

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rainforest Scientific  

/ rān′fôr′ĭst /

1. A dense evergreen forest with an annual rainfall of at least 406 cm (160 inches).

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Closer Look

Most of the world's rainforests lie near the equator and have tropical climates. However, cooler rainforests exist in the Pacific Northwest region of the United States and Canada. The world's largest rainforest is located in the Amazon River basin. The Amazon rainforest has been described as the “lungs of our planet” because it continuously recycles carbon dioxide into oxygen, with a significant percentage of the world's atmospheric oxygen being produced in this region. Besides helping to regulate the world's climate, rainforests host an extraordinary diversity of life. Scientists believe that as many as half of the Earth's different species of plants and animals are found only in the rainforests, which take up a mere 7 percent of the world's landmass. By some estimates, more than half of the Earth's original rainforests have already been burned or cut down for timber or grazing land, and more than 130 plant, animal, and insect species are thought to be going extinct daily as a result of the lost habitat. Currently 25 percent of Western pharmaceuticals are derived from tropical rainforest ingredients, and 70 percent of the plants with anticancer properties are found only in this shrinking biome.

Etymology

Origin of rainforest

First recorded in 1900–05

Example Sentences

Police have confirmed that human remains found in a Tasmanian rainforest are most likely those of a Belgian backpacker who went missing in 2023 after going for a hike.

From BBC

Unusually intense monsoon rains pummelled parts of South and Southeast Asia in November and December, triggering landslides and floods from Indonesia's rainforests to highland plantations in Sri Lanka.

From Barron's

It is bordered by vast swamp forests and largely undisturbed lowland rainforest growing atop deep peat deposits.

From Science Daily

Mining, plantations, and fires have caused the clearance of large tracts of lush Indonesian rainforest, removing trees that absorbed rain and helped stabilise soil.

From Barron's

They were working in difficult conditions, in dense rainforests and exposed beaches in extreme humidity.

From BBC