shell
noun
°The calcareous or chitinous external covering of mollusks, crustaceans, and some other invertebrates.
"In some mollusks, as the cuttlefish, the shell is concealed by the animal's outer mantle and is considered internal."
°The hard calcareous covering of a bird egg.
verb
°To remove the outer covering or shell of something. See sheller.
°To bombard, to fire projectiles at.