angstrom
/ˈæŋstrəm/
noun
- A unit of length equal to one ten-billionth of a meter, used especially to measure wavelengths of light and distances between atoms.
- Visible light has wavelengths between about 4000 and 7000 angstroms.
- The crystal's atomic spacing was exactly 2.5 angstroms.
- The scientist measured the bond length in angstroms.