Shell

carapace

(entomology: exoskeleton of certain insects)

carapace

(conjoined scutes that comprise the "shell" of a tortoise or turtle)

carapace

(overlapping hard plates comprising the armor covering armadillo's body)

carcasse

(any hollow structure; framework, or exterior structure)

coque

(covering of a nut)

coque

(nautical: outer covering of the hull)

coquillage

(hard calcareous or chitinous external covering of many invertebrates)

coquille

(hard calcareous or chitinous external covering of many invertebrates)

coquille

(hard covering of an egg)

coquille

(psychological barrier to social interaction)

cosse

(pod)

couche

(chemistry: set of atomic orbitals that have the same principal quantum number)

douille

(casing of an artillery projectile)

interface système

(computing: general-purpose environment)

obus

(hollow usually spherical or cylindrical projectile fired from a mortar or a cannon)

squelette

(emaciated person)

douiller

(informal: to disburse or give up money, to pay)

décortiquer

(to remove the outer covering or shell of something)

écosser

(to remove the outer covering or shell of something)