Eggshell
Pronunciation : Egg"shell`
Part of Speech : n.
Definition : 1. The shell or exterior covering of an egg. Also used figuratively for anything resembling an eggshell.
2. (Zo?l.)
Defn: A smooth, white, marine, gastropod shell of the genus Ovulum, resembling an egg in form.
Source : Webster's Unabridged Dictionary, 1913