enhancer

[en-han-ser, -hahn-]
noun
1.
a person or thing that enhances.
2.
Genetics. a gene or gene fragment that activates other genes.

Origin:
enhance + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
enhance (ɪnˈhɑːns)
 
vb
(tr) to intensify or increase in quality, value, power, etc; improve; augment
 
[C14: from Old French enhaucier, from en-1 + haucier to raise, from Vulgar Latin altiāre (unattested), from Latin altus high]
 
en'hancement
 
n
 
en'hancer
 
n
 
en'hancive
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Industry claims it adds caffeine as a flavour enhancer, stating its bitter
  taste offsets the otherwise sweet taste.
Propranolol is not exactly a cutting-edge performance enhancer.
It's really once again demonstrated that the ultimate performance enhancer is
  indeed the mustache on the athletic playing field.
Researchers can exploit enhancers in experiments by fusing a known enhancer to
  a gene that they want to regulate.
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