The term Ex utero related to gestation occurring outside the mother's body.
During the Federation-Klingon War, L'Rell learned that she had become pregnant. Being involved in a mission involving the father, she decided that she could not carry out her plans while carrying a child. L'Rell had the embryo removed and gestated ex utero, after which the infant was cared for in secret by the House of Mo'Kai. As a result of the procedure, the child was smaller than other Klingon infants. (DIS: "Point of Light")
The term is Latin and means "out of the uterus". It is opposite of the more conventional term "In utero", which means inside of the womb.