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 Synesthesia. Synesthesia: A condition in which the normal separation between the senses appears to have broken down. In synesthesia, sight may mingle with sound, taste with touch, and so on. Females are more often affected than males.