Definition of environmentalist noun from the Oxford Advanced American Dictionary

  

environmentalist

 noun
noun
NAmE//ɪnˌvaɪərnˈmɛntlæ#x2027ːɪst//
 
, NAmE//ɪnˌvaɪrənˈmɛntlæ#x2027ːɪst//
 
 
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a person who is concerned about the natural environment and wants to improve and protect it
environmentalism
 
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NAmE//ɪnˌvaɪərnˈmɛntlˌɪzəm//
 
, NAmE//ɪnˌvaɪrənˈmɛntlˌɪzəm//
 
noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: environmentalist