what is a synergist muscle
Definition of SYNERGIST. : something (as a chemical or a muscle) that enhances the effectiveness of an active agent; broadly: either member of a synergistic pair.ADVERTISEMENT.noun synÂ·erÂ·gist \-jÉst\. something (as a chemical or a muscle) that enhances the effectiveness of an active agent; broadly: either member of a synergistic pair. ADVERTISEMENT.