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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. 2014.
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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


/ˈæŋstrəm; Swedish ˈɔŋstrœm/
Anders Jonas (ˈandərs ˈjuːnas). 1814–74, Swedish physicist, noted for his work on spectroscopy and solar physics
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 Swed. 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.
Swedish physicist and astronomer who pioneered the use of the spectroscope in the analysis of radiation. By studying the spectrum of visible light given off by the Sun, Ångström discovered that there is hydrogen in the Sun's atmosphere. The angstrom unit of measurement is named for him.
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

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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