femtobarn

F4E1M3T1O1B3A1R1N1

noun

A unit of area equal to a billionth of a millionth (10⁻¹⁵) of a barn

OriginEnglish barn ← Danish femten ← Old Norse fimmtán →
Scrabble 16
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Meanings

nounfemtobarn (plural femtobarns)

plural femtobarns

  1. natural sciencesA unit of area equal to a billionth of a millionth (10⁻¹⁵) of a barn

Origin

  1. Proto-Indo-European*pénkʷe
  2. Proto-Germanic*fimf
  3. Proto-Indo-European*déḱm̥
  4. Proto-Germanic*tehun
  5. Proto-Germanic*fimftehun
  6. Old Norsefimmtán
  7. Danishfemten
  8. Englishfemto-
  9. Englishbarn
  10. Englishfemtobarn

From femto- + barn.

Full word history & related roots →
Cite this entry
APA

femtobarn. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/femtobarn

MLA

“femtobarn.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/femtobarn. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “femtobarn,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/femtobarn.

Source: femtobarn on Wiktionary, CC BY-SA 4.0.