Unfertilized egg is a term referred to the eggs that do not have a sperm cell fertilizing it. There are various synonyms for the word unfertilized egg, including clear egg, infertile egg, sterile egg, and dead egg. These terms are commonly used in the farming and poultry industry to describe the eggs that haven't been fertilized by a male rooster. Clear eggs are those that do not have a yolk or embryo inside, while infertile eggs are those that fail to develop to a chick. Sterile eggs, on the other hand, are those that cannot be fertilized due to various factors such as old age or disease. Dead eggs are eggs that do not hatch and are considered unusable.