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Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   angstrom unit
       n 1: a metric unit of length equal to one ten billionth of a
            meter (or 0.0001 micron); used to specify wavelengths of
            electromagnetic radiation [syn: angstrom, angstrom
    unit, A]