CARAPACE [\KAIR-uh-pace\] , noun;
1. The thick shell that covers the back of the turtle, the crab, and other animals.
2. Something likened to a shell that serves to protect or isolate from external influence.
My Sentence:
The wickedness of men is swollen under the guise of their carapace of hypocritical charity.
Origin:
Carapace comes from French, from Spanish carapacho, itself of uncertain origin.
Source: Online Dictionary