Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun 10-15 of a
metre . Symbol:fm
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a metric unit of length equal to one quadrillionth of a meter
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
femto- + metre
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Examples
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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.
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