from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Formation of the yolk of an egg.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. yolk deposition; the process of yolk formation via nutrients being deposited in the oocyte, or female germ cell involved in reproduction
vitell(us) + -genesis.(American Heritage® Dictionary of the English Language, Fourth Edition)