femtoampere

F4E1M3T1O1A1M3P3E1R1E1

noun

A billionth of a millionth (10⁻¹⁵) of an ampere. Symbol: fA

OriginEnglish ampere ← Danish femten ← Old Norse fimmtán →
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Meanings

nounfemtoampere (plural femtoamperes)

plural femtoamperes

  1. A billionth of a millionth (10⁻¹⁵) of an ampere. Symbol: fA

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. Englishampere
  10. Englishfemtoampere

From femto- + ampere.

Full word history & related roots →
Cite this entry
APA

femtoampere. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/femtoampere

MLA

“femtoampere.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/femtoampere. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “femtoampere,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/femtoampere.

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