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Pronunciation: mol


  1. An intrauterine mass formed by the degeneration of the partly developed products of conception.
  2. In the SI, the unit of amount of substance, defined as that amount of a substance containing as many “elementary entities” as there are atoms in 0.0120 kg of carbon-12; “elementary entities” may be atoms, molecules, ions, or any describable entity or defined mixture of entities and must be specified when this term is used; in practical terms, the mole is 6.0221367 × 1023 “elementary entities.”

Synonym(s): nevus2

[A.S. mael (L. macula), a spot]

See Also: Avogadro number

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.