suppressant

[suh-pres-uhnt]
noun
a substance that suppresses an undesirable action or condition: an appetite suppressant.

Origin:
1940–45; supress + -ant

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
suppressant (səˈprɛsənt)
 
adj
1.  tending to suppress or restrain an action or condition
 
n
2.  a suppressant drug or agent: a cough suppressant

Collins English Dictionary - Complete & Unabridged 10th Edition
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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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