ETYM Old Eng. yolke, yelke, yolke, yelke, AS. geoloca, geoleca, from geolu yellow. Related to Yellow.
Store of food, mostly in the form of fats and proteins, found in the eggs of many animals. It provides nourishment for the growing embryo.
(Homonym: yoke).
Nutritive material of an ovum esp. the yellow mass of a bird or reptile egg.