femtometre

See also: femtomètre and femto-metre

English

Etymology

From femto- +‎ metre.

Noun

femtometre (plural femtometres)

  2. (metrology) An SI unit of length equal to 10−15 metres. Symbol: fm
    Alternative forms: fm (symbol), femtometer (US)
    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.

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