Usually means: Number of protons in zirconium.
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We found 7 dictionaries that define the word atomic number 40:

General (6 matching dictionaries)
  1. atomic number 40: Vocabulary.com
  2. atomic number 40: Dictionary.com
  3. Atomic number 40: Rhymezone
  4. atomic number 40: FreeDictionary.org
  5. atomic number 40: Mnemonic Dictionary
  6. atomic number 40: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. atomic number 40: Encyclopedia

Definitions from WordNet (Atomic number 40)

noun:  a lustrous gray strong metallic element resembling titanium; it is used in nuclear reactors as a neutron absorber; it occurs in baddeleyite but is obtained chiefly from zircon

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