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helmet shell

noun
1.
a predatory marine gastropod of the family Cassidae, characterized by a thick, heavy shell with a broadened outer lip.
2.
the shell of this animal, often used for making cameos.
Origin of helmet shell
1745-1755
1745-55
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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11
12
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