neptunium
noun/nepˈtjuːniəm/
/nepˈtuːniəm/
[uncountable] (symbol Np)
- a chemical element. Neptunium is a radioactive metal.Word Originlate 19th cent.: from Neptune, on the pattern of uranium (Neptune being the next planet beyond Uranus).
Want to learn more?
Find out which words work together and produce more natural sounding English with the Oxford Collocations Dictionary app.
Check pronunciation:
neptunium