nanometre

Etymology

nano- + metre

noun

1. An SI subunit of length equal to 10⁻⁹ metres. Symbol: nm
   We live our lives in three dimensions for our threescore and ten allotted years. Yet every branch of contemporary science, from statistics to cosmology, alludes to processes that operate on scales outside of human experience: the millisecond and the nanometer, the eon and the light-year. 2012-01, Robert L. Dorit, “Rereading Darwin”, in American Scientist, volume 100, number 1, archived from the original on 2012-11-14, page 23