n :  a radioactive metallic element that is chemically similar to uranium and is obtained in nuclear reactors as a by-product in the production of plutonium - symbol Np - see ELEMENT  table
 
Nep•tune Roman mythological character. Neptune was originally the god of fresh water. Later he became identified with the Greek god Poseidon, a deity of the sea. In art Neptune is usually represented as a bearded man holding a trident and sometimes a fish. The planet Neptune was named after him and the element neptunium was named after the planet.
 
 
 
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