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/ˈæŋstɹəm/ · noun
(physics, metrology) A unit of length equal to 10⁻¹⁰ meters (that is, one ten-billionth of a meter), approximately the size of an atom, and denoted by the symbol Å, used especially to measure the wavelength of electromagnetic radiation or distances between atoms..
Use angstrom when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Angstrom means (physics, metrology) A unit of length equal to 10⁻¹⁰ meters (that is, one ten-billionth of a meter), approximately the size of an atom, and denoted by the symbol Å, used especially to measure the wavelength of electromagnetic radiation or distances between atoms..
Common synonyms include Å, angstrom unit, AU, ㍳.
The opposite depends on the specific sense.
Use angstrom where its definition matches the intended context.
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