1745–55; anti- + septic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
antiseptic (ˌæntɪˈsɛptɪk)
1.  of, relating to, or effecting antisepsis
2.  entirely free from contamination
3.  informal lacking spirit or excitement; clinical
4.  an antiseptic agent or substance

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1751, coined from anti- "against" + septic, from Gk. sepsis "putrefaction."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

antiseptic an·ti·sep·tic (ān'tĭ-sěp'tĭk)

  1. Of, relating to, or producing antisepsis.

  2. Capable of preventing infection by inhibiting the growth of infectious agents.

A substance that inhibits the proliferation of infectious agents.
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
antiseptic   (ān'tĭ-sěp'tĭk)  Pronunciation Key 
A substance that inhibits the proliferation of infectious microorganisms.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They seem to teach that technology can make us invulnerable and that war is
  clean, neat and antiseptic.
Try as one might, this perfect, antiseptic world some people envisage is
Hydrogen peroxide is a potent oxidant and antiseptic that rapidly destroys
  living matter.
Vinegar's antiseptic properties also proved beneficial.
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