What does "nanometre" mean?

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

What is a synonym for "nanometre"?

Common synonyms include: nanometer, nm, micromillimeter, micromillimetre, millimicron.

Pronounced //ˈnænə(ʊ)ˌmiːtə(ɹ)//.

/ˈnænə(ʊ)ˌmiːtə(ɹ)/ noun

noun ·Rare ·Advanced level

Noun

1
An SI subunit of length equal to 10⁻⁹ metres.
"Holonyms: micrometre < millimetre < centimetre < decimetre < metre < kilometre < megametre < gigametre < terametre < petametre"
2
a metric unit of length equal to one billionth of a meter wordnet

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

From nano- + metre.