One of the mysteries of the English language finally explained.
A marine leuconoid sponge of the genus Poterion, which forms a very large, goblet-shaped structure.
Mid 19th century; earliest use found in Robert Edmond Grant (1793–1874), comparative anatomist and transmutationist. From the genitive of Neptune + cup.
Neptune's cup/ˈnɛptjuːnz kʌp//ˈnɛptʃuːnz kʌp/
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