The term CHEMIST'S AMOUNT is a crossword solution that can be filled in with the word GRAM, which is a unit of measurement in the metric system. A GRAM is equal to one thousandth of a kilogram and is commonly used to measure the mass of small objects. In chemistry, it is often used to measure the amount of a substance. Therefore, CHEMIST'S AMOUNT can be interpreted as the amount of a substance that a chemist would measure.