n. (also gramme) a metric unit of mass equal to one-thousandth of a kilogram. gram-atom Chem. the quantity of a chemical element equal to its relative atomic mass in grams (see MOLE(4)). gram-equivalent Chem. the quantity of a substance equal to its equivalent weight in grams. gram-molecule Chem. the quantity of a substance equal to its relative molecular mass in grams.
[ F gramme f. Gk gramma small weight ]