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What is "neptune's cup"

The Collaborative International Dictionary
Neptune's cup

Neptune \Nep"tune\, prop. n. [L. Neptunus.]

  1. (Rom. Myth.) The son of Saturn and Ops, the god of the waters, especially of the sea. He is represented as bearing a trident for a scepter.

  2. (Astron.) The remotest major planet of our solar system, discovered -- as a result of the computations of Leverrier, of Paris -- by Galle, of Berlin, September 23, 1846. It is classed as a gas giant, and has a radius of 22,716 km and an estimated mass of

    1. 027 x 10^ 26 kg, with an average density of

    2. 27 g/cc. Its mean distance from the sun is about 5,000,000,000 km (3,106,856,000 miles), and its period of revolution is about 164.78 years.

      Neptune powder, an explosive containing nitroglycerin, -- used in blasting.

      Neptune's cup (Zo["o]l.), a very large, cup-shaped, marine sponge ( Thalassema Neptuni).