Yolk (noun)

The yellow, spherical part of an egg that surrounds the embryo.

Origin:

Middle english yolke, from old english geoloca; akin to old high german gelochan yolk, latin gelus frost.

Examples:

1. The yolk of the egg is high in fat and cholesterol.
2. The yolk is the part of the egg that is used to fertilize the egg.
3. She separated the yolk from the egg white.
4. The yolk is the most nutritious part of the egg.
5. He broke the yolk and it spilled all over the pan.