蛋殼
Eggshell \Egg"shell`\, n. 1. The shell or exterior covering of an egg. Also used figuratively for anything resembling an eggshell. 2. (Zo["o]l.) A smooth, white, marine, gastropod shell of the genus {Ovulum}, resembling an egg in form.
eggshell n : the exterior covering of a bird's egg [syn: {shell}]