promoter

[pruh-moh-ter]
noun
1.
a person or thing that promotes, furthers, or encourages.
2.
a person who initiates or takes part in the organizing of a company, development of a project, etc.
3.
a person who organizes and provides financial backing for a sporting event or entertainment.
4.
Chemistry. any substance that in small amounts is capable of increasing the activity of a catalyst.
5.
Also called collector. Metallurgy. a water-repellent reagent enhancing the ability of certain ores to float so that they can be extracted by the flotation process.
6.
Genetics.
a.
a site on a DNA molecule at which RNA polymerase binds and initiates transcription.
b.
a gene sequence that activates transcription.
7.
Obsolete. an informer.

Origin:
1400–50; late Middle English; see promote, -er1; replacing earlier promotour < Anglo-French

self-promoter, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
promoter (prəˈməʊtə)
 
n
1.  a person or thing that promotes
2.  a person who helps to organize, develop, or finance an undertaking
3.  a person who organizes and finances a sporting event, esp a boxing match
4.  chem a substance added in small amounts to a catalyst to increase its activity
5.  genetics a sequence of nucleotides, associated with a structural gene, that must bind with messenger RNA polymerase before transcription can proceed

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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American Heritage
Medical Dictionary

promoter pro·mot·er (prə-mō'tər)
n.

  1. A substance that increases the activity of a catalyst.

  2. A DNA molecule to which RNA polymerase binds, initiating the transcription of mRNA.

  3. A chemical that may promote carcinogenicity or mutagenicity.

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
promoter   (prə-mō'tər)  Pronunciation Key 
The region of an operon that acts as the initial binding site for RNA polymerase.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

promoter

in chemistry, substance added to a solid catalyst to improve its performance in a chemical reaction. By itself the promoter has little or no catalytic effect. Some promoters interact with active components of catalysts and thereby alter their chemical effect on the catalyzed substance. The interaction may cause changes in the electronic or crystal structures of the active solid component. Commonly used promoters are metallic ions incorporated into metals and metallic oxide catalysts, reducing and oxidizing gases or liquids, and acids and bases added during the reaction or to the catalysts before being used.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Interesting that you mention those who fear being perceived as a shameless self
  promoter.
The ironic thing is that the anti-vaccine group could be viewed as also blindly
  following people who promoter their agenda.
She was always a brilliant performer, a sedulous promoter of her own myth.
He knew or could get to every mercenary, adventurer, or promoter who had ever
  cast a shadow on that continent.
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