angstrom unit

/AE1 NG S T R AH0 M Y UW1 N AH0 T/
noun
  1. 1

    A unit of length equal to 10−10 meters (that is, one ten-billionth of a meter), approximately the size of an atom, and denoted by the symbol Å, used especially to measure the wavelength of electromagnetic radiation or distances between atoms.

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Source: https://en.wiktionary.org/wiki/angstrom, https://en.wiktionary.org/wiki/angstrom%20unit