Final answer:
The perimetrium is the exterior covering of the uterus and the correct term for the layer of the peritoneum that covers the uterus's outer surface.
Step-by-step explanation:
The term used for the layer of the peritoneum that covers the outer surface of the uterus is the perimetrium. This is the most superficial layer of the uterus and consists of epithelial tissue. It provides the external covering for the uterus. It also secretes fluid that allows for small movements of the uterus within the pelvis, reducing friction against other organs. Below the perimetrium is the myometrium, a thick layer of smooth muscle responsible for uterine contractions. The innermost layer is the endometrium, which thickens during the menstrual cycle to potentially nourish an embryo or is shed during menstruation if fertilization does not occur.