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  1. femtometre love

Definitions

Wiktionary

  1. n. 10-15 of a metre. Symbol: fm

WordNet 3.0

  1. n. a metric unit of length equal to one quadrillionth of a meter

Etymologies

  1. femto- +‎ metre (Wiktionary)

Examples

  • “The proton and the neutron have a diameter of 10-15m (a femtometre or a millionth of a millionth of a millimetre) and the electron is at least 1,000 times smaller.”

    The Nobel Prize in Physics 1992

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hypernyms (1)

Words that are more generic or abstract

  1. metric linear unit

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