ANGSTROM
\ˈaŋstɹɒm], \ˈaŋstɹɒm], \ˈa_ŋ_s_t_ɹ_ɒ_m]\
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a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
By Princeton University