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olive shell

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noun
  1. any marine gastropod of the family Olividae, having a polished, highly colored, elongated shell and a large mantle that, when extended, surrounds the shell.
  2. the shell itself.
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Origin of olive shell

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018