Definition - What does Uteri mean?
Uteri is the plural form of uterus. A uterus is a major reproductive organ with a primary role of housing and nourish a developing fetus prior to birth.
FertilitySmarts explains Uteri
It is possible for a woman to have two uteri with a condition known as a septate uterus, where a membrane, called a septum, splits the uterus completely or partially.
Because there are seldom instances where you might be referring to more than one uterus at once, this fantastic word is underused, in our humble opinion.