Rainforest definitions

rān'fôr'ĭst, fŏr'-
A dense evergreen forest with a minimum annual rainfall of approximately 180 centimeters (71 inches). Rainforests are found chiefly in the tropics but also occur in temperate regions, where the rainfall amount is somewhat lower.
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A dense evergreen forest with a minimum annual rainfall of approximately 180 centimeters (71 inches). Rainforests are found chiefly in the tropics but also occur in temperate regions, where the rainfall amount is somewhat lower.
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A dense, evergreen forest, often, specif., one in a tropical region, having abundant rainfall throughout the year.
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Rainforest is defined as a dense, green, moist forest with at least 160 inches of rain each year that is mostly found in the tropics.

An example of a rainforest is the Brazilian rainforest.

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A dense evergreen forest with an annual rainfall of at least 406 cm (160 inches).
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A forest in a climate with high annual rainfall and no dry season.
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Origin of rainforest

rain +"Ž forest, a calque of German Regenwald.