We found 29 dictionaries that define the word neptunium:

General (19 matching dictionaries)

1. neptunium: Merriam-Webster
2. neptunium: Oxford Learner's Dictionaries
3. neptunium: American Heritage Dictionary of the English Language
4. neptunium: Collins English Dictionary
5. neptunium: Vocabulary.com
6. neptunium: Wordnik
7. neptunium: Wiktionary
8. neptunium: Webster's New World College Dictionary, 4th Ed.
9. neptunium: The Wordsmyth English Dictionary-Thesaurus
10. neptunium: Infoplease Dictionary
11. neptunium: Dictionary.com
12. Neptunium: Wikipedia, the Free Encyclopedia
13. Neptunium: Online Plain Text English Dictionary
14. neptunium: Webster's Revised Unabridged, 1913 Edition
15. neptunium: Rhymezone
16. Neptunium: AllWords.com Multi-Lingual Dictionary
17. neptunium: FreeDictionary.org
18. neptunium: Mnemonic Dictionary
19. neptunium: TheFreeDictionary.com

Art (1 matching dictionary)

20. An Etymological Dictionary of Classical Mythology (No longer online)

Business (1 matching dictionary)

21. neptunium: Financial dictionary

Computing (1 matching dictionary)

22. neptunium: Encyclopedia

Medicine (5 matching dictionaries)

23. neptunium: Merriam-Webster Medical Dictionary
24. Dorland's Illustrated Medical Dictionary (No longer online)
25. Medical Dictionary (No longer online)
26. online medical dictionary (No longer online)
27. neptunium: Medical dictionary

Science (2 matching dictionaries)

28. Neptunium: Extragalactic Astronomy
29. Neptunium, neptunium: WebElements Periodic Table of the Elements

Definitions from Wiktionary (neptunium) ▸ noun:  The transuranic chemical element with atomic number 93 and symbol Np. Similar: NP, atomic number 93, neon, Neptunian, neon-21, nilium, neutrium, neon-20, nitrogen-13, neutrite, more... Opposite: uranium, plutonium, americium Phrases: neptunium series, Isotopes of neptunium, more... Adjectives: new, transuranic, separate, first, pure, pentavalent ▸ Words similar to neptunium ▸ Usage examples for neptunium ▸ Idioms related to neptunium ▸ Wikipedia articles (New!) ▸ Popular adjectives describing neptunium ▸ Words that often appear near neptunium ▸ Rhymes of neptunium ▸ Invented words related to neptunium