SINCE 1828
dictionary
thesaurus
view recents

neptunium series

noun
Save Word

Definition of neptunium series

: a radioactive series that does not now occur in nature and that begins with plutonium of mass number 241 and continues to americium, to the longest-lived member of the series neptunium of mass number 237, and eventually to the stable end product bismuth

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Learn More About neptunium series

Dictionary Entries Near neptunium series

neptunium

neptunium series

ne quid nimis

See More Nearby Entries 

Statistics for neptunium series

Cite this Entry

“Neptunium series.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/neptunium%20series. Accessed 19 Oct. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

nomenclature

Listen to the pronunciation of nomenclature

See Definitions and Examples »

Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play
Ask the Editors
Word Games