Etymology
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nanometer (n.)

also nanometre, "one-billionth of a meter," 1963, from nano- + meter (n.2).

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Definitions of nanometer

nanometer (n.)
a metric unit of length equal to one billionth of a meter;
Synonyms: nanometre / nm / millimicron / micromillimeter / micromillimetre
From wordnet.princeton.edu