angstrom unit

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angstrom unit

n. Abbr. A.U. or a.u.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Noun1.angstrom unit - a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
metric linear unit - a linear unit of distance in metric terms
micromicron, picometer, picometre - a metric unit of length equal to one trillionth of a meter
micromillimeter, micromillimetre, millimicron, nanometer, nanometre, nm - a metric unit of length equal to one billionth of a meter
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