fMRI

noun

By · According to Wiktionary data (CC BY-SA) ·

"fmri" is a 4-letter English headword indexed on PlainSpell.

The verdict

“fMRI” has 6 generated spelling variants in the English index at frequency #42,643. The variants make it a useful spelling check.

#42,643
frequency rank, English
2,507
“F” headwords
6
tracked misspellings
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of functional magnetic resonance imaging.

Corpus desk

Index EN-fmri · fMRI · English

fMRI · rank #42,643 · 6 variants · 20 confusables

  • FREQ-MID #42,643
  • LEN-MID 4 letters
  • VOW-1 1 vowel
  • CONFUS-HIGH 20 pairs
  • VAR-MID 6 variants
  • BOOK-MID 2,507
  • PHOTO-FINISH foi

Nearest frequency peer: foi (+1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Rank peers near misspelling magnet “fMRI”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “fMRI” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

fMRI vs for
25% similar
fMRI vs fur
25% similar
fMRI vs fry
25% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for fMRI
PropertyValue
HeadwordfMRI
LanguageEnglish
Part of speechNoun
Letters4
Frequency rank#42,643
Misspellings tracked6
Confusable pairs20
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “fMRI”

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right).fMRIlands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Same rarity band neighbours include “foi” (#42,644), “foie” (#42,645), “fete” (#42,639). Among 2,507 “F” headwords, “fMRI” is #42,643. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 6 spelling variants around fMRI, anoun. Corpus frequency is #42,643 among 2,507 “F” headwords. Wiktionary lists 3 senses, so context still picks the gloss.

Our generated misspelling index lists 6 likely wrong-spelling variants for fMRI, with forms such as "ffmri", "fmir", and "fmmri". Each of these forms differs from the correct spelling by one small edit: a doubled letter, a dropped silent letter, or a substituted vowel. It also participates in 20 confusable-pair relationships, "for", "fur", "fry", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From f- + MRI. The correct English form is fMRI, spelled F-M-R-I.

Definition

  1. 1
    Initialism of functional magnetic resonance imaging.
  2. 2
    Initialism of functional magnetic resonance imager.
  3. 3
    Initialism of functional magnetic resonance image.

Recorded use

Wiktionary examples

These source excerpts show how fMRI appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. fMRI has not been carried out yet in the group of paedophilia or other paraphiliae. Given the much better spatial and in particular higher temporal resolution it may be the tool of preference.
  2. Functional magnetic resonance imaging (fMRI) visualizes the blood oxygen level-dependent (BOLD) signal in the brain, which indexes neural activity.

Etymology

From f- + MRI.

Synonyms

functional MRI

Common misspellings

Also misspelled as:

  • ffmri
  • fmir
  • fmmri
  • fmrri
  • frmi
  • mfri

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of fMRI - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.

ffmri1fmir2fmmri1fmrri1frmi2mfri2
Edit distance from "fMRI"

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "fMRI"?
"fMRI" is spelled F-M-R-I.
What does "fMRI" mean?
As a noun, "fMRI" means: Initialism of functional magnetic resonance imaging.
What words are commonly confused with "fMRI"?
"fMRI" is commonly confused with "for", "fur", "fry". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
What is the origin of the word "fMRI"?
From f- + MRI. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "fMRI", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 4 letters (nearest by frequency rank).

foie#42,645fete#42,639FARC#42,636gaff#42,659

Similar misspelling depth

Headwords with a similar count of attested misspellings (6 here; floor ≥5).

easel6 variantsKrauss6 variantsabate6 variantsZhen6 variants

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list