Definition of rainforest noun from the Oxford Advanced Learner's Dictionary

 

rainforest

 noun
noun
BrE BrE//ˈreɪnfɒrɪst//
 
; NAmE NAmE//ˈreɪnfɔːrɪst//
 
, NAmE//ˈreɪnfɑːrɪst//
 
[countable, uncountable] Other geographic regions, Conservation
 
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a thick forest in tropical parts of the world that have a lot of rain the Amazon rainforest compare cloud forest See related entries: Other geographic regions, Conservation
See the Oxford Advanced American Dictionary entry: rainforest