zy·go·sis 
(zī-gōsĭs, zĭ-)
(zī-gōsĭs, zĭ-)n. pl. zy·go·ses (-sēz)
The union of gametes to form a zygote; conjugation.
- cryptorchism
- cryptosporidiosis
- cryptosporidium
- cryptozoite
- cryptozoological
- cryptozoologist
- cryptozoology
- cry/say uncle
- crystal
- crystal ball
- crystal clear
- crystal-clear
- crystal detector
- crystal gazer
- crystal gazing
- crystalize
- crystalize
- crystall-
- crystall-
- crystal lattice
- crystalliferous
- crystalligerous
- crystallin
- crystalline
- crystalline lens