Usually means: Metallic element used in alloys.
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We found 28 dictionaries that define the word niobium:

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

Art (1 matching dictionary)
  1. An Etymological Dictionary of Classical Mythology (No longer online)

Computing (1 matching dictionary)
  1. niobium: Encyclopedia

Medicine (5 matching dictionaries)
  1. niobium: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Medical Dictionary (No longer online)
  4. online medical dictionary (No longer online)
  5. niobium: Medical dictionary

Science (2 matching dictionaries)
  1. Niobium: Extragalactic Astronomy
  2. niobium: WebElements Periodic Table of the Elements

(Note: See niobiums as well.)

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Definitions from Wiktionary (niobium)

▸ noun:  A chemical element (symbol Nb) with an atomic number of 41: a light grey, crystalline, ductile transition metal used in superconducting materials.
▸ noun:  (countable) A single atom of this element.

Similar:
NB, atomic number 41, niobate, neodymium, niobophyllite, niobocarbide, natroniobite, niobite, nickel, niobokupletskite, more...

Phrases:
niobium carbide, Niobium pentoxide, Isotopes of niobium, Niobium diselenide, more...

Adjectives:
pure, metallic, zirconium, high, unalloyed, ferro, solid, separate, irradiated, more, nickel

Colors:
    silver,     gray,     charcoal,     gunmetal,     pewter, more...

▸ Words similar to niobium

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▸ Rhymes of niobium

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Similar:
NB, atomic number 41, niobate, neodymium, niobophyllite, niobocarbide, natroniobite, niobite, nickel, niobokupletskite, more...

Phrases:
niobium carbide, Niobium pentoxide, Isotopes of niobium, Niobium diselenide, more...

Adjectives:
pure, metallic, zirconium, high, unalloyed, ferro, solid, separate, irradiated, more, nickel

Colors:
    silver,     gray,     charcoal,     gunmetal,     pewter, more...



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