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CARAPACE (a Fr. word, from the Span. carapacho, a shield or armor), the upper shell of a crustacean, tortoise or turtle. The covering of the armadillo is called a carapace, as is also the hard case in which certain of the Infusoria are enclosed.
noun
Zoological: A protective shield.
Specifically:
1) The upper shell of crabs, lobsters, and other crustaceans.
2) The upper half of the immovable case enclosing a tortoise, turtle, or other chelonian.
“This casing is composed of two shields, covered with horny plates; the upper one, which is more or less highly arched, is termed the carapace.” - Carpenter
3) The case in which certain infusoria are enclosed.
[French carapace.]
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