- Animal shell - Hard shell of crabs or tortoises - Protective shell - Shell of a turtle for instance - Shell of tortoise - Shell of tortoise or turtle - The thick shell or shield which covers the back of the
tortoise, or turtle, the crab, and other crustaceous animals.
- A cuirass, originally of leather, afterward of plates of
metal or horn sewed on linen or the like. - Lute for protecting vessels from the fire. - The protective case or shell of an infusorian or rotifer.