Usually means: Number of protons in thorium.
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We found 7 dictionaries that define the word atomic number 90:

General (6 matching dictionaries)
  1. atomic number 90: Vocabulary.com
  2. atomic number 90: Dictionary.com
  3. Atomic number 90: Rhymezone
  4. atomic number 90: FreeDictionary.org
  5. atomic number 90: Mnemonic Dictionary
  6. atomic number 90: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. atomic number 90: Encyclopedia

Definitions from WordNet (Atomic number 90)

noun:  a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands


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