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

  

environmentalist

 noun
noun
BrE BrE//ɪnˌvaɪrənˈmentəlɪst//
 
; NAmE NAmE//ɪnˌvaɪrənˈmentəlɪst//
 
Waste and pollution
 
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a person who is concerned about the natural environment and wants to improve and protect it See related entries: Waste and pollution
See the Oxford Advanced American Dictionary entry: environmentalist