en·vi·ron·men·tal·ist

[en-vahy-ruhn-men-tl-ist, -vahy-ern-]
noun
1.
an expert on environmental problems.
2.
any person who advocates or works to protect the air, water, animals, plants, and other natural resources from pollution or its effects.
3.
a person who believes that differences between individuals or groups, especially in moral and intellectual attributes, are predominantly determined by environmental factors, as surroundings, upbringing, or experience (opposed to hereditarian ).

Origin:
1915–20; environmental + -ist

en·vi·ron·men·tal·ism, noun
an·ti·en·vi·ron·men·tal·ist, noun, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To Environmentalists
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World English Dictionary
environmentalist (ɪnˌvaɪrənˈmɛntəlɪst) [Click for IPA pronunciation guide]
 
n
1.  an adherent of environmentalism
2.  a person who is concerned with the maintenance of ecological balance and the conservation of the environment
3.  a person concerned with issues that affect the environment, such as pollution

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Environmentalists is always a great word to know.
So is flibbertigibbet. Does it mean:
a scrap or morsel of food left at a meal.
a chattering or flighty, light-headed person.
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