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n. An SI subunit of length equal to 10-9 metres. Symbol: nm


n. a metric unit of length equal to one billionth of a meter [syn: nanometer, nm, millimicron, micromillimeter, micromillimetre]


The nanometre ( International spelling as used by the International Bureau of Weights and Measures; SI symbol: nm) or nanometer ( American spelling) is a unit of length in the metric system, equal to one billionth of a metre ( m). The name combines the SI prefix nano- (from the Ancient Greek , , "dwarf") with the parent unit name metre (from Greek , , "unit of measurement"). It can be written in scientific notation as , in engineering notation as , and is simply metres. One nanometre equals ten ångströms.

Usage examples of "nanometre".

That was when I got serious about my research, and found out about the Sedge Grass Support Group, and learned from them that fragments of the rhizomes only 500 nanometres long had been observed to regenerate the full plant in a single growing season.