What does "nanometre" mean?

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

How do you pronounce "nanometre"?

Pronounced //ˈnænə(ʊ)ˌmiːtə(ɹ)//.

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

//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.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.