Angstrom

ahd-5
  • noun. A unit of length equal to one hundred-millionth (10−8) of a centimeter, used especially to specify radiation wavelengths.
    • Wiktionary, Creative Commons Attribution/Share-Alike License
  • noun. A very small unit of length, 10-10 m, approximately the size of an atom, used especially to measure the wavelength of electromagnetic radiation or distances between atoms. Symbol Å
    • Word Usage
    "(An angstrom is one ten-billionth of a meter, the approximate diameter of a single atom.)"
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