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[ang-struh m] /ˈæŋ strəm/
noun, (often initial capital letter)
a unit of length, equal to one tenth of a millimicron, or one ten millionth of a millimeter, primarily used to express electromagnetic wavelengths. Symbol: Å;
Abbreviation: A.
Also called angstrom unit, Angstrom unit.
1895-1900; named after A. J. Ångström Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for angstrom-unit


/ˈæŋstrʌm; -strəm/
Also called angstrom unit. a unit of length equal to 10–10 metre, used principally to express the wavelengths of electromagnetic radiations. It is equivalent to 0.1 nanometre Å, A
Word Origin
C20: named after Anders J. Ångström
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for angstrom-unit



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).

Online Etymology Dictionary, © 2010 Douglas Harper
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angstrom-unit in Medicine

angstrom ang·strom or ång·strom (āng'strəm)
Abbr. A, Å, angst
A unit of length equal to one hundred millionth (10-8) of a centimeter, used especially to specify radiation wavelengths.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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angstrom-unit in Science
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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Encyclopedia Article for angstrom-unit


unit of length used chiefly in measuring wavelengths of light, equal to 1010 metre, or 0.1 nanometer. It is named for the 19th-century Swedish physicist Anders Jonas Angstrom. The angstrom and multiples of it, the micron (104 A) and the millimicron (10 A), are also used to measure such quantities as molecular diameters and the thickness of films on liquids

Learn more about angstrom with a free trial on
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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