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• angstrom
  angstrom

  noun

  a unit of length, equal to one tenth of a millimicron, or one ten millionth of a millimeter, primarily used to express electromagnetic wavelengths. Å; A
• Ångström
  Ångström

  noun

  Anders Jonas 1814–74, Swedish astronomer and physicist.

angstrom

¹ American  

[ang-struhm] / ˈæŋ strəm /

noun

(often initial capital letter)

1. a unit of length, equal to one tenth of a millimicron, or one ten millionth of a millimeter, primarily used to express electromagnetic wavelengths. Å; A

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Ångström ² American  

[ang-struhm, awng-strœm] / ˈæŋ strəm, ˈɔŋ strœm /

noun

1. Anders Jonas 1814–74, Swedish astronomer and physicist.

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Ångström ¹ British  

/ ˈæŋstrəm, ˈɔŋstrœm /

noun

1. Anders Jonas (ˈandərs ˈjuːnas). 1814–74, Swedish physicist, noted for his work on spectroscopy and solar physics

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angstrom ² British  

/ ˈæŋstrʌm, -strəm /

noun

1.  Å.   A.  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

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Ångström ¹ Scientific  

/ ăng′strəm /

1. 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.

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angstrom ² Scientific  

/ ăng′strəm /

1. 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.

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Etymology

Origin of angstrom

First recorded in 1895–1900; named after A. J. Ångström ( def. )

Example Sentences

Dark stars have a smoking gun signature, an absorption feature at 1640 Angstrom, due to the large amounts of singly ionized helium in their atmospheres.

From Science Daily • Oct. 14, 2025

The acquisition of Angstrom is expected to be completed in the third quarter of 2023.

From Reuters • Jul. 17, 2023

Facing delays, Angstrom Manufacturing in Missouri ended up buying another business that already had FDA approval, President Chris Carron said.

From Seattle Times • Apr. 11, 2022

The A stands for Angstrom, which is a metric unit of length equivalent to 0.1 nanometres.

From BBC • Jul. 28, 2021

Our last great middle-class hero, someone who really enjoyed his vacations and his country club, was John Updike’s Rabbit Angstrom, and he died a premature death.

From "Class Matters" by The New York Times