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helmet shell

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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.
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Origin of helmet shell

First recorded in 1745–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018