Definition: The term "subnano" comes from Greek, literally meaning "below a billionth" or "less than one part in a million." It's used to describe very small particles at the nanometer scale, which can be considered below the size of a bacterium or a grain of sand. This range is crucial for many applications where precision and sensitivity are essential. For example, in medicine, subnanomolar concentrations of drugs are critical to diagnose and treat diseases accurately.
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