mass - the property of a body that causes it to have weight in a gravitational field

combining weight, eq, equivalent weight, equivalent - the atomic weight of an element that has the same combining capacity as a given weight of another element; the standard is 8 for oxygen

meq, milliequivalent - one-thousandth of an equivalent

chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions