Neptune's cup

noun

variants or less commonly Neptune's goblet
: either of two very large cup-shaped sponges (Poterion neptuni and P. amphitritae) sometimes four feet high

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Dictionary Entries Near Neptune's cup

Neptune

Neptune's cup

neptune shell

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“Neptune's cup.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Neptune%27s%20cup. Accessed 22 Nov. 2024.

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