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helmet shell
Americannoun
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a predatory marine gastropod of the family Cassidae, characterized by a thick, heavy shell with a broadened outer lip.
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the shell of this animal, often used for making cameos.
Etymology
Origin of helmet shell
First recorded in 1745–55
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
