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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. [1913 Webster] 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.
[1913 Webster +PJC]
Neptune powder, an explosive containing nitroglycerin, --
used in blasting.
Neptune s cup (Zo"ol.), a very large, cup-shaped, marine
sponge ({Thalassema Neptuni}).
[1913 Webster]
Source: The Collaborative International Dictionary of English