What does Blighted ovum mean?

Blighted ovum meaning in Medical Dictionary

A fertilized ovum (egg) that failed to develop or whoever development stopped at an earlier stage, before 6 or 7 weeks of pregnancy. Regarding ultrasound examination of a blighted ovum, only the gestational sac that typically surrounds the embryo is visible. There was frequently no embryo in the gestational sac. A blighted ovum is a type of very early natural abortion (miscarriage).