The term 'Liquid Unit' can be defined as a DROP, which is a four-letter word. A DROP is a unit of measure for liquid volume, typically used in the context of medicine or cooking. It is equal to one-hundredth of a milliliter, or 0.05 milliliters. Drops are also used to measure the amount of liquid in a container, such as a bottle or jar. In some cases, drops may also refer to the amount of liquid that falls from a dropper or pipette.