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.
synâ¢drome. 1. a group of symptoms that together are characteristic of a specific disorder, disease, or the like. 2. a predictable, characteristic condition or pattern of behavior that tends to occur under certain circumstances: the empty nest syndrome. syndromá¸ concurrence, combination = syn-syn - + -dromÄ running].yndrome. n. 1. (Medicine) med any combination of signs and symptoms that are indicative of a particular disease or disorder. 2. a symptom, characteristic, or set of symptoms or characteristics indicating the existence of a condition, problem, etc.