Definition of angstrom noun from the Oxford Advanced American Dictionary

 

angstrom

 noun
noun
NAmE//ˈæŋstrəm//
 
(chemistry)(physics)
 
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a very small unit of length, equal to 1 x 10⁻1⁰ meters, used for measuring wavelengths and the distance between atoms
See the Oxford Advanced Learner's Dictionary entry: angstrom