What does "femtometre" mean?

An SI unit of length equal to 10⁻¹⁵ metres. Symbol: fm

What is a synonym for "femtometre"?

Common synonyms include: femtometer, femtometer, fermi.

Femtometre

Q: How do you use "femtometre" in a sentence?

Holonyms: picometre < nanometre < micrometre < millimetre < centimetre < decimetre < metre < kilometre < megametre < gigametre < terametre < petametre < exametre < zettametre < yottametre < ronnametre < quettametre

noun

noun ·Rare ·Advanced level

Definitions

Noun

1
An SI unit of length equal to 10⁻¹⁵ metres. Symbol: fm
"Holonyms: picometre < nanometre < micrometre < millimetre < centimetre < decimetre < metre < kilometre < megametre < gigametre < terametre < petametre < exametre < zettametre < yottametre < ronnametre < quettametre"
2
a metric unit of length equal to one quadrillionth of a meter wordnet

Synonyms

All synonyms

femtometer femtometer fermi

Example

More examples

"Holonyms: picometre < nanometre < micrometre < millimetre < centimetre < decimetre < metre < kilometre < megametre < gigametre < terametre < petametre < exametre < zettametre < yottametre < ronnametre < quettametre"

Etymology

From femto- + metre.

More for "femtometre"

Synonyms Sentences Pronunciation Translate

Next best steps

Find stronger synonyms See usage examples Check pronunciation Browse writing guides

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