fermi

F4E1R1M3I1
/ˈfɜː(ɹ)mi//ˈfɛə(ɹ)mi/

noun

An obsolete name of the unit of length equal to one femtometre (10⁻¹⁵ m).

Similar
femtometerfemtometre
OriginItalian Fermi ← Latin Firmum →
Less commonScrabble 10
Ask AI about this wordChatGPTClaudePerplexityGoogle AIGrok

Meanings

fermi1

nounfermi (plural fermis)

plural fermis

  1. An obsolete name of the unit of length equal to one femtometre (10⁻¹⁵ m).

Fermi2

proper nounFermi (countable and uncountable, plural Fermis or Fermies)

plural Fermis · plural Fermies

  1. countableuncountableA surname from Italian.
  2. countableuncountableThe physicist Enrico Fermi

Synonyms & antonyms

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

Similar
femtometerfemtometre
Broader
metric linear unit
Also see
femtometre

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

fermi · noun

Named after Italian physicist Enrico Fermi.

Full word history & related roots →

Fermi · proper noun

  1. LatinFirmum
  2. ItalianFermo
  3. ItalianFermi
  4. EnglishFermi

Borrowed from Italian Fermi.

More words from Italian

Full word history & related roots →
Cite this entry
APA

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

MLA

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

Chicago

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

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