nep·tu·ni·um 
(nĕp-tnē-əm, -ty-)
(nĕp-tnē-əm, -ty-)n. Symbol Np
A silvery, metallic, naturally radioactive element, atomic number 93, the first of the transuranium elements. Its longest-lived isotope is Np-237 with a half-life of 2.1 million years. Found in trace quantities in uranium ores, it is produced synthetically by nuclear reactions. See Periodic Table.
[After the planet NEPTUNE (from the fact that it follows uranium in the periodic table).]
- polish off
- politburo
- polite
- politely
- politeness
- politesse
- politic
- political
- political action committee
- political correctness
- political economy
- political incorrectness
- politicalization
- politicalize
- politically
- politically correct
- politically incorrect
- political prisoner
- political science
- political scientist
- politician
- politicization
- politicize
- politick
- politicker