[1] : The Collaborative International Dictionary of English v.0.48

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.
      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 zool., a very large, cup-shaped, marine
      sponge thalassema neptuni.
      1913 webster
see also:
26 neptune powder neptune's cup thalassema neptuni 

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