Final answer:
Ectopic pregnancy is the condition that describes a fertilized egg developing outside the uterus.
Step-by-step explanation:
The condition that correctly describes a fertilized egg developing outside the uterus is ectopic pregnancy.
In an ectopic pregnancy, the embryo implants and grows outside of the uterus, typically in the fallopian tubes. However, it can also occur in other locations, such as the ovaries or abdominal cavity.
An ectopic pregnancy is a serious medical condition that requires immediate medical attention, as it can lead to complications and is not a viable pregnancy.