Etymology
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carapace (n.)

"upper shell of a turtle or tortoise; shell of an insect, crustacean, etc.," 1836, from French carapace "tortoise shell" (18c.), from Spanish carapacho or Portuguese carapaça, which is of uncertain origin, perhaps somehow from Latin capa (see cape (n.1)). Related: Carapacial.

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Definitions of carapace

carapace (n.)
hard outer covering or case of certain organisms such as arthropods and turtles;
Synonyms: shell / cuticle / shield
From wordnet.princeton.edu