Usually means: Radioactive isotope, potassium, beta decay.
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We found 5 dictionaries that define the word potassium-40:

General (2 matching dictionaries)
  1. potassium-40: Wiktionary
  2. potassium-40: Dictionary.com

Computing (1 matching dictionary)
  1. potassium-40: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. potassium-40: Medical dictionary

Definitions from Wiktionary (potassium-40)

noun:  (physics) A naturally-occurring radioactive isotope of potassium, ⁴⁰₁₉K, having nineteen protons and twenty-one neutrons, and a half-life of 1.3 billion years; it is the chief source of natural radioactivity in living tissue

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