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We found 29 dictionaries with English definitions that include the word niobium:
Click on the first link on a line below to go directly to a page where "niobium" is defined.

General (22 matching dictionaries)

1. niobium: Merriam-Webster.com [home, info]
2. niobium: Oxford Learner's Dictionaries [home, info]
3. niobium: American Heritage Dictionary of the English Language [home, info]
4. niobium: Collins English Dictionary [home, info]
5. niobium: Vocabulary.com [home, info]
6. Niobium, niobium: Wordnik [home, info]
7. niobium: Wiktionary [home, info]
8. niobium: Webster's New World College Dictionary, 4th Ed. [home, info]
9. niobium: The Wordsmyth English Dictionary-Thesaurus [home, info]
10. niobium: Infoplease Dictionary [home, info]
11. niobium: Dictionary.com [home, info]
12. niobium: UltraLingua English Dictionary [home, info]
13. Niobium: Wikipedia, the Free Encyclopedia [home, info]
14. Niobium: Online Plain Text English Dictionary [home, info]
15. niobium: Webster's Revised Unabridged, 1913 Edition [home, info]
16. niobium: Rhymezone [home, info]
17. Niobium: AllWords.com Multi-Lingual Dictionary [home, info]
18. niobium: Free Dictionary [home, info]
19. niobium: Mnemonic Dictionary [home, info]
20. niobium: WordNet 1.7 Vocabulary Helper [home, info]
21. niobium: LookWAYup Translating Dictionary/Thesaurus [home, info]
22. niobium: Dictionary/thesaurus [home, info]

Art (1 matching dictionary)

23. niobium: An Etymological Dictionary of Classical Mythology [home, info]

Computing (1 matching dictionary)

24. niobium: Encyclopedia [home, info]

Medicine (3 matching dictionaries)

25. Niobium: Medical Dictionary [home, info]
26. niobium: online medical dictionary [home, info]
27. niobium: Medical dictionary [home, info]

Science (2 matching dictionaries)

28. Niobium: Extragalactic Astronomy [home, info]
29. niobium: WebElements Periodic Table of the Elements [home, info]

(Note: See niobiums for more definitions.)

Quick definitions from WordNet (niobium) ▸ noun:  a soft gray ductile metallic element used in alloys; occurs in niobite; formerly called columbium ▸ Also see niobiums ▸ Words similar to niobium ▸ Usage examples for niobium ▸ Idioms related to niobium (New!) ▸ Popular adjectives describing niobium ▸ Words that often appear near niobium ▸ Rhymes of niobium ▸ Invented words related to niobium