nanometre n 1: a metric unit of length equal to one billionth of a meter [syn: {nanometer}, {nanometre}, {nm}, {millimicron}, {micromillimeter}, {micromillimetre}]
nanometre <unit> 10^-9 metres; one thousand millionth part of a metre. The wavelength of visible light and dimensions in {nanotechnology} are typically measured in nanometres. (2003-05-02)