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.
There is a stop-cock between the trocar and syringe, and another at right angles to the syringe. The operation is performed with a combined instrument called the trocar and cannula. I then introduced a trocar and canula, and drew off fifty ounces of pus, slightly tinged with blood. As the trocar is withdrawn, the canula should be pushed still further in. The best instruments are the trocar and canula, but in the absence of these a pocket knife and goose quill may be made to answer. It consists of a powerful syringe, which fits accurately to the trocar with which the puncture is made.