The front wings of these beetles are fused forming a single, hardened shell, from which this group derives its Latin name.

As the water dries, the carrier forms a hardened shell around the load.

Mr. Tillman's small office, though, belies his hardened shell.

In the winter, the coating becomes a hardened shell; therefore, it can survive in the cold weather similar to a spore.

Under the hardened outer shell, the stuff felt gritty and wet, as if the groundwater had somehow seeped in, undermining the concrete.

It was that hardened shell that kept him afloat.

Her skin is a hardened shell, providing her body with a heavy armor capable of withstanding blows from forged weapons, such as swords or axes.

It's the one about the sensitive but troubled student and the teacher who seeks to break through his hardened shell to show him how special he is.

The front wings are fused forming a single, hardened shell.

I quickly wiped my tears and returned to the inner safety of my hardened shell.