a substance that suppresses an undesirable action or condition: an appetite suppressant.

1940–45; supress + -ant Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
suppressant (səˈprɛsənt)
1.  tending to suppress or restrain an action or condition
2.  a suppressant drug or agent: a cough suppressant

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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Example sentences
You'll get some sleep that way between the sedation and the cough suppressant.
The versatile soybean will make its debut tomorrow as a spray-on dust suppressant for horse tracks.
There are multiple treatments for this potentially disabling disease, including various immune suppressant medications.
Blend component of numerous refrigerants and a fire suppressant.
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