A nanometer is a billionth of a meter. This means that a nanometer is about the size of a grain of sand.

  • The drug is designed to work at a distance of one nanometer.

  • The nanometer is the smallest unit of distance that light can travel.

Definition of nanometers


a metric unit of length equal to one billionth of a meter


micromillimeter, micromillimetre, millimicron, nanometre, nm

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nanometers Pronunciation in a video (2)