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''.