- the weight in grams of an element that combines with or replaces 1 g of hydrogen;
- the atomic or molecular weight in grams of an atom or group of atoms involved in a chemical reaction divided by the number of electrons donated, taken up, or shared by the atom or group of atoms in the course of that reaction;
- the weight of a substance contained in 1 L of 1 n solution; a variant of (1).
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Examples: glitazone, GI cocktail, etc.