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vitello-, vitell- (Latin: yolk, yolk of an egg).

1. The part of the ovary in some invertebrates that produces yolk-filled cells providing nourishment to the developing eggs.
2. That part of the ovary in certain flatworms that produces yolk filled cells.
Yolk producing or producing yolk.
In biochemistry, protein in the yolk of an egg.
1. A reference to the yolk of an egg.
2. Of a yellow color, like an egg yolk.
vitelline membrane:
The membrane that encloses a fertilized egg.
The yolk of an egg. The word vitellus was first used in the sense "yolk of an egg", by Aulus Cornelius Celsus, a Roman physician and writer of the early first century.