vitello-, vitell- (Latin: yolk, yolk of an egg).vitellarium: 
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. vitelligenous: 
Yolk producing or producing yolk.
 
vitellin: 
In biochemistry, protein in the yolk of an egg.
 
vitelline: 
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.
 
vitellus: 
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.
 
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