A more thorough explanation:

Definition: A unit of measurement for liquids, equal to 1/8 of an ounce. It is also used to refer to a small amount of any liquid, especially alcohol.

Examples:

• A pharmacist may measure out a dram of medicine for a patient.
• He poured himself a dram of whiskey before bed.
• She only needed a dram of vanilla extract for the recipe.

The examples illustrate how a dram can refer to a specific measurement of liquid, or a small amount of any liquid. In the first example, a pharmacist is using a dram as a precise measurement for medicine. In the second example, the person is using a dram to refer to a small amount of whiskey. In the third example, the person only needs a small amount of vanilla extract, which can be referred to as a dram.