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| A3 |
abbreviation of "angstrom" or "angstroms," a unit of length equal to one hundred-millionth of a centimeter, used in measuring light waves. |
| angstrom |
(often cap.) a unit of length equal to one hundred-millionth of a centimeter, used in measuring light waves; angstrom unit. (abbr.: A, A.U.) |
| nanometer |
a unit of length equal to one billionth of a meter; angstrom. |
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