Etymology
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rain forest (n.)

"dense forest in an area of high rainfall with little seasonal variation," 1899, apparently a loan-translation of German Regenwald, coined by A.F.W. Schimper for his 1898 work "Pflanzengeographie."

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Definitions of rain forest

rain forest (n.)
a forest with heavy annual rainfall;
Synonyms: rainforest
From wordnet.princeton.edu