candling

egg-grading process in which the egg is inspected before a penetrating light in a darkened room for signs of fertility, defects, or freshness. First ...
Found on http://www.britannica.com/eb/a-z/c/15

Candling

Shining a light through an egg to see whether it is developing or not.
Found on http://www.sialis.org/glossary.htm

Candling

using a candler to check the contents of an egg
Found on http://afspoultry.ca.uky.edu/extension-glossary
No exact match found