mol(n = noun.quantity) gram molecule, mole - the molecular weight of a substance expressed in grams; the basic unit of amount of substance adopted under the Systeme International d'Unites; Array
A quantity of a substance equal to the molecular weight of a substance expressed in grams; a gram molecule; the basic unit of amount of substance adopted under the System International d'Unites; as, he added two mols of dextrose to the medium. [WordNet 1.5]