The amount of liquid that a dropper can hold or dispense when the bulb is fully squeezed.
Compound of 'dropper' and 'ful' (Old English '-full'), creating a unit of measurement based on the dropper's capacity.
When you give a child medicine, 'one dropperful' is instantly understood—it's an old-fashioned measurement unit that survives because it's practical and intuitive, far more useful than trying to measure milliliters by hand.
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