This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Any chemical or agent which regulates one or more genes by increasing the rate of transcription.

n. One who, or that which, activates.

n. An agent that enables the flotation of a mineral or minerals.

n. any agency bringing about activation; (Biol.) a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription.

n. (biology) any agency bringing about activation; a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription

"| Reply some of hte things on there arn’t as crappy as they make it seem. sure the activator is strange. but you got to hand it to sony for thinking outside of the box 15 or so years ago .."

substance   

sensitiser    activating agent    sensitizer    catalyst    accelerator   

chemoattractant    repressor    dimer    internalization    adaptor