Zona Pellucida:
The protective outer membrane surrounding the egg.
Zygote:
A fertilized egg which has not yet divided.
Zygote Intrafallopian Transfer (ZIFT):
An ART in which eggs are removed from a woman's ovaries, fertilized with the man's sperm in a lab dish, and the resulting Zygotes are transferred into the woman's fallopian tubes during a minor surgical procedure.
