Eggshell (noun)

The thin and brittle outer covering of an egg.

Origin:

Late 16th century: from egg + shell.

Examples:

1. The eggshell was broken and the yolk spilled out.
2. The bird carefully cracked the eggshell to reveal the chick inside.
3. The eggshell was so delicate that it could be crushed with just a little pressure.
4. The eggshell was covered in a fine layer of dust and debris.
5. The eggshell provided a protective layer for the developing embryo.