Main Entry: pro·mot·er

Pronunciation: \-ˈmōt-ər\

Function: noun

1 : a substance that in very small amounts is able to increase the activity of a catalyst
2 : a binding site in a DNA chain at which RNA polymerase binds to initiate transcription of messenger RNA by one or more nearby structural genes
3 : a chemical believed to promote carcinogenicity or mutagenicity