an expert in science, especially one of the physical or natural sciences.

1825–35; < Latin scient(ia) science + -ist

nonscientist, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
scientist (ˈsaɪəntɪst)
a person who studies or practises any of the sciences or who uses scientific methods

Scientist (ˈsaɪəntɪst)
1.  Christian Science Christ as supreme spiritual healer
2.  See Christian Science short for Christian Scientist

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1834, coined from L. scientia (see science) by the Rev. William Whewell (17941866), Eng. polymath, by analogy with artist.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Scientists now are decoding the blueprint of human life.
They are also both the sort of thing climate scientists expect more of in a
  warming world.
If scientists want their views to be accorded the respect due to science, then
  they must speak as scientists, not as lobbyists.
One reason is that scientists seem likely to argue about the validity of her
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