What is Egg ?
Egg is (noun) 1. an oval object with a hard shell, produced by a female bird or reptile, from which a baby comes The owl laid three eggs in the nest. Turtles lay their eggs in the sand. 2. a chicken’s egg, used as food You need three eggs to make this cake. boiled egg an egg which has been cooked by boiling in water poached egg an egg which is taken out of its shell, cooked whole in hot water and often eaten on toast at breakfast don’t put all your eggs in one basket don’t risk everything on only one project 3. a reproductive cell produced by a female, which is fertilised by sperm from a male Doctors implanted a fertilised egg in her womb.
source: Easier English, Student Dictionary Upper Intermediate Level