Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A unit of length equal to one femtometer (10-15 meter).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A unit of length equal to one femtometer or femtometre (10−15 m).

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

After Enrico Fermi.

Examples

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