Science Dictionary
angstrom   (āng'strəm)  Pronunciation Key 
A unit of length equal to one hundred-millionth (10-10) of a meter. It was once used to measure wavelengths of light and the diameters of atoms, but has now been mostly replaced by the nanometer.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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