# fermi

> English word · Noun · IPA /ˈfɜː(ɹ)mi/ · frequency rank #35,718

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

## Etymology
Named after Italian physicist Enrico Fermi.

## Easily confused with
- **form** (https://plainspell.com/en/vs/fermi-vs-form)
- **firm** (https://plainspell.com/en/vs/fermi-vs-firm)
- **fern** (https://plainspell.com/en/vs/fermi-vs-fern)
- **fMRI** (https://plainspell.com/en/vs/fermi-vs-fmri)
- **forms** (https://plainspell.com/en/vs/fermi-vs-forms)
- **ferry** (https://plainspell.com/en/vs/fermi-vs-ferry)
- **Ferris** (https://plainspell.com/en/vs/fermi-vs-ferris)
- **FEI** (https://plainspell.com/en/vs/fei-vs-fermi)
- **fer** (https://plainspell.com/en/vs/fer-vs-fermi)
- **fem** (https://plainspell.com/en/vs/fem-vs-fermi)
- **farm** (https://plainspell.com/en/vs/farm-vs-fermi)
- **FEMA** (https://plainspell.com/en/vs/fema-vs-fermi)
- **farms** (https://plainspell.com/en/vs/farms-vs-fermi)
- **feral** (https://plainspell.com/en/vs/feral-vs-fermi)
- **femme** (https://plainspell.com/en/vs/femme-vs-fermi)
- **Farsi** (https://plainspell.com/en/vs/farsi-vs-fermi)
- **Fergie** (https://plainspell.com/en/vs/fergie-vs-fermi)

## Common misspellings (7)
`efrmi`, `femri`, `ferim`, `fermmi`, `ferrmi`, `ffermi`, `fremi`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/fermi