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neptunium Definition

nep·tu·nium (nep to̵̅o̅nē əm, -tyo̵̅o̅-)

noun

a silver-colored, radioactive, metallic chemical element, one of the actinides, produced by bombarding uranium atoms with neutrons: symbol, Np; at. no., 93

Etymology: ModL < Neptunus, Neptune + -ium: so named by Edwin Mattison McMillan & P. Abelson (1913-2004), U.S. physicists, because its at. no. is next after uranium's, as the planet Neptune is next beyond Uranus

neptunium Usage Examples

Modifies a noun

  • series: Now there are 11 cases in addition to those in the Neptunium series.

Browse dictionary entries near neptunium

  1. Neptune
  2. nepotism
  3. nephrotomy
  4. nephrosis
  5. nephron
  6. nephrology
  7. nephrogenic
  8. nephro-
  9. nephritis
  10. nephritic
  1. neptunium series
  2. NERC
  3. nerd
  4. Nereid
  5. nereis
  6. Nereus
  7. neritic
  8. Nernst
  9. Nero
  10. neroli