synergist
syn·er·gist
noun \-jəst\Definition of SYNERGIST
1
: an agent that increases the effectiveness of another agent when combined with it; especially : a drug that acts in synergism with another
2
: an organ (as a muscle) that acts in concert with another to enhance its effect—compare agonist 1, antagonist a
Learn More About
Seen & Heard 
What made you want to look up synergist? Please tell us where you read or heard it (including the quote, if possible).
