psy·cho·ac·tive

[sahy-koh-ak-tiv]
adjective
of or pertaining to a substance having a profound or significant effect on mental processes: a psychoactive drug.

Origin:
1960–65; psycho- + active

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
psychoactive (ˌsaɪkəʊˈæktɪv) [Click for IPA pronunciation guide]
 
adj
capable of affecting mental activity: a psychoactive drug

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Psychoactive is always a great word to know.
So is callithumpian. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
American Heritage
Medical Dictionary

psychoactive psy·cho·ac·tive (sī'kō-āk'tĭv)
adj.
Affecting the mind or mental processes. Used of a drug.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Tobacco smoke may contain a psychoactive ingredient other than nicotine.
Caffeine, a psychoactive drug used by nearly everybody, alters human
  neurochemistry.
Tobacco is considered to be a mood and behavior altering substance that is
  psychoactive and abusable.
Some of the biggest blockbusters are psychoactive drugs.
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