murex
noun
any marine gastropod of the genus Murex, common in tropical seas, certain species of which yield the royal purple dye valued by the ancients.
The grammatical form denoting more than one person, place, thing, or idea.
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It includes many of the large ornamental shells, as the miters, murices, olives, purpuras, volutes, and whelks.
From The Gutenberg Webster's Unabridged Dictionary Section R by Project Gutenberg