Gemellary pregnancy is a medical term used to describe a pregnancy where two fetuses are developing simultaneously in the uterus. Some of the synonyms for this condition include twin pregnancy, multiple pregnancy, and multifoetal gestation. Another less commonly used synonym for gemellary pregnancy is a biparous pregnancy which refers to the number of birth outcomes rather than the number of fetuses. In some cases, gemellary pregnancy may also be referred to as a dual pregnancy or a double pregnancy. It is important to remember that while the terminology may differ, the medical care required for gemellary pregnancy remains the same, as it is considered a high-risk pregnancy.