The outer layer of the uterus is called the perimetrium; it is the visceral. peritoneum of the uterus. The endometrium has two distinct layers (Fig. 28.9c): (1) The functional layer changes in. response to the monthly pattern of hormones.
uk â /ËpÉªn.É.kÉl/ us â /ËpÉªn.É.kÉl/. âº [ C usually singular ] the most successful or admired part of a system or achievement: By the age of 32 she had reached the pinnacle of her career.
Definition of tyrant for Students. 1  1 : a ruler who has no legal limits on his or her power. 2  2 : a ruler who exercises total power harshly and cruelly. 3  3 : a person who uses authority or power harshly My boss is a real tyrant.