Checking saved dictionary data and trusted language sources. This will stop automatically if a source does not respond.
Pronunciation varies by accent · noun
(metrology) 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
Meronyms: yoctometre < zeptometre < attometre
The speed of light is about 0.3 femtometres per yoctosecond.
Use femtometre when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Femtometre means (metrology) An SI unit of length equal to 10⁻¹⁵ metres. Symbol: fm.
Common synonyms include femtometer, fermi.
The opposite depends on the specific sense.
Holonyms: picometre < nanometre < micrometre < millimetre < centimetre < decimetre < metre < kilometre < megametre < gigametre < terametre < petametre < exametre < zettametre < yottametre < ronnametre < quettametre
FreeDictionaryAPI.com / Wiktionary · Original source · CC BY-SA 4.0
Dictionary data is provided by FreeDictionaryAPI.com and sourced from Wiktionary under its stated license.