femtometer

F4E1M3T1O1M3E1T1E1R1

A form of femtometre — An SI unit of length equal to 10⁻¹⁵ metres. Symbol: fm

Similar
femtometrefermi
OriginEnglish meter ← Danish femten ← Old Norse fimmtán →
Scrabble 17
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Meanings

nounfemtometer (plural femtometers)

plural femtometers

  1. USUS spelling of femtometre.

Synonyms & antonyms

nouna metric unit of length equal to one quadrillionth of a meter

Similar
femtometrefermi
Broader
metric linear unit
Also see
femtometrefermi

Synonym sets from Open English WordNet, CC BY 4.0.

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. Englishmeter
  10. Englishfemtometer

From femto- + meter.

Full word history & related roots →

Rhymes & wordplay

Anagrams

femtometre
Cite this entry
APA

femtometer. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/femtometer

MLA

“femtometer.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/femtometer. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “femtometer,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/femtometer.

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