Definition of Mole

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Mole: 1. In dermatology a mole is a pigmented spot on the skin, Also called a nevus. 2. In gynecology, a mass within the uterus formed of partly developed products of conception.
3. In biochemistry, the molecular weight of a substance. In more technical terms, a mole is the number of atoms in exactly 12 g of carbon-12. Mole in this sense is short for molecular weight.