Angstrom (n.)

unit of length equal to one hundred millionth of a centimeter (used to measure wavelengths of light), 1892, named for Swedish physicist Anders Ångström (1814-1874).

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Definitions of Angstrom from WordNet

angstrom (n.)
a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation;
Synonyms: angstrom unit / a