Eggshell
Eggshell
Eggshell (/ˈɛɡʃɛl/) is the outer covering of a bird's egg, which protects the embryo contained within from bacterial contamination.
Etymology
The term "eggshell" originates from the Old Norse word "eggskjallr". "Egg" refers to the reproductive body produced by birds, while "skjallr" means shell or husk.
Structure
An eggshell is made primarily of calcium carbonate (CaCO3) crystals. It is a semipermeable structure, allowing gases to pass through its pores. The shell also contains a thin layer called the cuticle, which helps prevent contamination.
Related Terms
- Calcium carbonate: The primary mineral that makes up the eggshell.
- Cuticle (egg): A thin layer on the outer surface of the eggshell that prevents contamination.
- Embryo: The early stage of development of an organism, protected by the eggshell in bird species.
- Bird: The class of animals that typically lay eggs with hard eggshells.
Uses
Eggshells have various uses, both in the culinary and agricultural world. They are often used as a calcium supplement in animal feed. In gardening, crushed eggshells can be used as a natural pesticide, as they deter certain types of pests.
See Also
External links
- Medical encyclopedia article on Eggshell
- Wikipedia's article - Eggshell
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