a bony or chitinous shield, test, or shell covering some or all of the dorsal part of an animal, as of a turtle.

1830–40; < French < Spanish carapacho, of obscure origin

carapaced, adjective
carapacial [kar-uh-pey-shuhl] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
carapace (ˈkærəˌpeɪs)
the thick hard shield, made of chitin or bone, that covers part of the body of crabs, lobsters, tortoises, etc
[C19: from French, from Spanish carapacho, of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1836, from Fr. carapace "tortoise shell," from Port. carapaça, of uncertain origin, perhaps somehow from L. capa (see cape (1)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
carapace   (kār'ə-pās')  Pronunciation Key 
A hard outer covering or shell made of bone or chitin on the back of animals such as turtles, armadillos, lobsters, and crabs.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Nothing alive and warm could make its way in through my carapace.
They have a carapace that covers an unsegmented thorax and abdomen.
It's carefully designed, with a sumptuously cantilevered icy-white carapace
  over a brushed aluminum hull.
Something in the music had pierced his public carapace and attacked the
  individual unconscious.
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