Medical Definition of narcissistic personality disorder. : a personality disorder characterized especially by an exaggerated sense of self-importance, persistent need for admiration, lack of empathy for others, excessive pride in achievements, and snobbish, disdainful, or patronizing attitudes.
For the purposes of sym metry, letâs now move on to the most common variant of syn- , or sym- , which also means âtogether.â A sym phony is the sounding âtogetherâ of many instruments.
Medical 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 effectâcompare agonist 1, antagonist a. something (as a chemical or a muscle) that enhances the effectiveness of an active agent; broadly: either member of a synergistic pair. ADVERTISEMENT.