nanometre

noun

1. An SI subunit of length equal to 10⁻⁹ metres.

   “Holonyms: micrometre < millimetre < centimetre < decimetre < metre < kilometre < megametre < gigametre < terametre < petametre”

   “Meronym: picometre”

   “A nanometre is one billionth of a metre. A single atom is between a tenth to half a nanometre across; a million or more of them stacked on top of one another would equal the thickness of a piece of paper.”

   “The resulting nanopasta is 372 nanometres thick, or about the same size as a measles virus.”