A unit of length in the International System of Units (SI) equal to one billionth of a meter (10-9 meter). Once called a millimicron, it is used to represent wavelength. Abbreviated nm.
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A unit of length in the International System of Units (SI) equal to one billionth of a meter (10-9 meter). Once called a millimicron, it is used to represent wavelength. Abbreviated nm.