femtobel

F4E1M3T1O1B3E1L1

noun

An SI unit of relative power equal to 10⁻¹⁵ bels. Symbol: f

Similar
fB
OriginEnglish bel ← Danish femten ← Old Norse fimmtán →
Scrabble 15
Ask AI about this wordChatGPTClaudePerplexityGoogle AIGrok

Meanings

nounfemtobel (plural femtobels)

plural femtobels

  1. metrologyAn SI unit of relative power equal to 10⁻¹⁵ bels. Symbol: f

    Synonyms: fB

Synonyms & antonyms

nounAn SI unit of relative power equal to 10⁻¹⁵ bels. Symbol: f

Similar
fB

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. Englishbel
  10. Englishfemtobel

From femto- + bel.

Full word history & related roots →
Cite this entry
APA

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

MLA

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

Chicago

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

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