an·ti·de·pres·sant

[an-tee-di-pres-uhnt, an-tahy-] Pharmacology.
adjective
1.
of or pertaining to a substance that is used in the treatment of mood disorders, as characterized by various manic or depressive affects.
noun
2.
Also called energizer, psychic energizer. any such substance, as a tricyclic antidepressant, MAO inhibitor, or lithium.
Also, an·ti-de·pres·sant, an·ti·de·pres·sive [an-tee-di-pres-iv, an-tahy-] .


Origin:
1960–65; anti- + depressant

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
antidepressant (ˌæntɪdɪˈprɛsənt) [Click for IPA pronunciation guide]
 
n
1.  any of a class of drugs used to alleviate depression
 
adj
2.  of or relating to this class of drugs

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Antidepressant is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Etymonline
Word Origin & History

antidepressant
by 1959, from anti- + depress + adj. suffix -ant.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

antidepressant an·ti·de·pres·sant (ān'tē-dĭ-prěs'ənt, ān'tī-)
n.
A drug used to prevent or relieve mental depression.


an'ti·de·pres'sive (-prěs'ĭv) adj.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
antidepressant   (ān'tē-dĭ-prěs'ənt, ān'tī-)  Pronunciation Key 
A drug used to prevent or treat depression.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In that trial the scientists were actually testing reserpine for antidepressant
  effects, and they found it to decrease depression.
Amitriptyline hydrochloride is a type of prescription medicine called a
  tricyclic antidepressant.
The company is also developing a blood test to monitor antidepressant therapy.
He went into a deep depression for several weeks, then after visiting his
  doctor he was hospitalized and put on an antidepressant.
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