Very small drops of liquid, especially of water or a spray.
From 'drop' (a small amount of liquid) plus '-let' (diminutive suffix meaning small). The word has been used since the 1800s to describe tiny liquid particles.
COVID transmission research obsessed over droplets versus aerosols—tiny physics changes everything. A droplet falls 6 feet; an aerosol floats indefinitely. The same virus, different physics, utterly different pandemic.
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