femtogram

F4E1M3T1O1G2R1A1M3

noun

An SI unit of mass equal to 10⁻¹⁵ grams. Symbol: fg

OriginEnglish gram ← Danish femten ← Old Norse fimmtán →
Scrabble 17
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Meanings

nounfemtogram (plural femtograms)

plural femtograms · alternative UK femtogramme

  1. metrologyAn SI unit of mass equal to 10⁻¹⁵ grams. Symbol: fg

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. Englishgram
  10. Englishfemtogram

From femto- + gram.

Full word history & related roots →

Translations

Finnish femtogramma
  • femtogrammaunit of mass
Spanish femtogramo
  • femtogramounit of mass
Swedish femtogram
  • femtogramunit of mass
Cite this entry
APA

femtogram. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/femtogram

MLA

“femtogram.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/femtogram. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “femtogram,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/femtogram.

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