Search Result for "activator": 
Wordnet 3.0

NOUN (1)

1. (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; 



The Collaborative International Dictionary of English v.0.48:

activator \activator\ n.
   1. 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.
      [WordNet 1.5]


WordNet (r) 3.0 (2006):

activator
    n 1: (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 [ant: inhibitor]