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moon shell

American  

noun

  1. any marine gastropod of the family Naticidae, having a rounded, short-spired, smooth shell.

  2. the shell itself.

Etymology

Origin of moon shell

First recorded in 1935–40

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.