neptunium
noun
- element with atomic number 93
Wiktionary
Pronunciation: /nɛpˈtjuːniəm/ / /nɛpˈtuːniəm/
noun
Etymology: From Neptune + -ium, after the planet. The previous element is uranium, named after the previous planet: Uranus.
- The transuranic chemical element with atomic number 93 and symbol Np.