noun
a metric unit of length equal to one quadrillionth of a meter
• Syn: ↑femtometre, ↑fermi
• Hypernyms: ↑metric linear unit
• Part Holonyms: ↑picometer, ↑picometre, ↑micromicron
* * *
/fem"teuh mee'teuhr/, n. Physics.
fermi. Symbol: fm
[1970-75; FEMTO- + METER1]
Useful english dictionary. 2012.