Narcissists believe their personality and appearance is superior to others. Symptoms of narcissism include focusing only on one's self, lacking guilt and an inability to empathize. Narcissistic people tend to be vain. A marriage being undermined by narcissism might benefit from therapy.
Trocar: A sharply pointed shaft, usually with a three-sided point. A trocar may be used within a cannula, a hollow tube, designed to be inserted into a vein, artery, bone marrow or body cavity. The word trocar is derived from the French trois (three) + carre (side). Last Editorial Review: 6/9/2016.
canÂ·nuÂ·la. A tube that can be inserted into a cavity, usually by means of a trocar filling its lumen; after insertion of the cannula, the trocar is withdrawn and the cannula remains as a channel for the transport of fluid or passage of instruments.anÂ·nuÂ·la. A tube that can be inserted into a cavity, usually by means of a trocar filling its lumen; after insertion of the cannula, the trocar is withdrawn and the cannula remains as a channel for the transport of fluid or passage of instruments.