Definition of neptunium
: a radioactive metallic element that is chemically similar to uranium and is obtained in nuclear reactors especially as a by-product in the production of plutonium — see element table
Origin and Etymology of neptunium
New Latin, from International Scientific Vocabulary Neptune
First Known Use: 1941See Words from the same year
NEPTUNIUM Defined for Kids
Definition of neptunium for Students
: a radioactive chemical element similar to uranium
Biographical Note for neptunium
Neptune \ˈnep-ˌt(y)ün\play , 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.
Learn More about neptunium
Britannica.com: Encyclopedia article about neptunium
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