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horse conch

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noun
  1. a marine gastropod, Pleuroploca gigantea, having a yellowish, spired shell that grows to a length of 2 feet (0.6 meters).
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Origin of horse conch

An Americanism dating back to 1865–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018