Avogadro's number or Avogadro number -.gäd-(.)rō-, -.gad- n the number 6.023 × 1023 indicating the number of atoms or molecules in a mole of any substance compare AVOGADRO'S LAW
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(N) (NA) the number of molecules in one mole of a substance: 6.023 Ч 1023.Medical dictionary. 2011.