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The Collaborative International Dictionary
Duck's-bill limpet

Duck's-bill \Duck's"-bill`\, a. Having the form of a duck's bill.

Duck's-bill limpet (Zo["o]l.), a limpet of the genus Parmaphorus; -- so named from its shape.

Wiktionary
duck's-bill limpet

n. A limpet of the genus ''Parmaphorus''.