environmentalist

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.
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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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00:10
Environmentalist has a plethora of syllables.
So is dichlorodiphenyltrichloroethane. Does it mean:
a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S.
opposition to the withdrawal of state support or recognition from an established church, esp. the Anglican Church in 19th-century England.
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