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horse conch

American  

noun

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

Etymology

Origin of horse conch

An Americanism dating back to 1865–70

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.