Nanometer (noun)

A unit of length equal to one billionth of a meter, often used to measure the size of atoms and molecules.

Origin:

From the greek word nanos meaning "dwarf" and the unit of measurement meter.

Examples:

1. The diameter of a hydrogen atom is about 0.1 nanometer.
2. A nanometer is one billionth of a meter.
3. The technology allows for precision on the scale of nanometers.
4. The width of a human hair is about 80,000 nanometers.
5. Nanometers are often used to measure the size of small structures in biology and chemistry.