brain

/bɹeɪn/

//bɹeɪn// noun

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

"brain" is a 5-letter English headword indexed on PlainSpell.

The verdict

“brain” has 6 generated spelling variants in the English index at frequency #1,215. The variants make it a useful spelling check.

#1,215
frequency rank, English
4,121
“B” headwords
6
tracked misspellings
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The control center of the central nervous system of an animal located in the skull which is responsible for perception, cognition, attention, memory, emotion, and action.

Corpus desk

Index EN-brain · brain · English

brain · rank #1,215 · 6 variants · 20 confusables

  • FREQ-COMMON #1,215
  • LEN-MID 5 letters
  • VOW-2 2 vowels
  • CONFUS-HIGH 20 pairs
  • VAR-MID 6 variants
  • BOOK-MID 4,121
  • PHOTO-FINISH battle

Nearest frequency peer: battle (-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 “brain”

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

corpus weight

What this shows “brain” 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).

brain vs Bri
40% similar
brain vs Brit
40% similar
brain vs brat
60% similar

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

Key facts for brain
PropertyValue
Headwordbrain
LanguageEnglish
Part of speechNoun
IPA/bɹeɪn/
Letters5
Frequency rank#1,215
Misspellings tracked6
Confusable pairs20
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “brain”

Word frequency stretches from the small set of words we reach for constantly (left) out to the long tail barely used once in a while (right).brainlands here:

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

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Same rarity band neighbours include “battle” (#1,214), “contract” (#1,216), “bar” (#1,213). Among 4,121 “B” headwords, “brain” is #1,215. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 6 spelling variants around brain (IPA /bɹeɪn/), anoun. Corpus frequency is #1,215 among 4,121 “B” headwords. Wiktionary lists 11 senses, so context still picks the gloss.

Our generated misspelling index lists 6 likely wrong-spelling variants for brain, with forms such as "barin", "bbrain", and "brainn". 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, "Bri", "Brit", "brat", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.

Etymologically, the entry records: From Middle English brayn, brain, from Old English bræġn (“brain”), from Proto-West Germanic *bragn, from Proto-Germanic *bragną (“brain”), from Proto-Indo-European *mregʰnom (“skull, brain”), from Proto-Indo-European *mregʰ- (“marrow, sinciput”) + *-mn̥ (“… The correct English form is brain, spelled B-R-A-I-N.

Definition

  1. 1
    The control center of the central nervous system of an animal located in the skull which is responsible for perception, cognition, attention, memory, emotion, and action.
  2. 2
    The control center of the central nervous system of an animal located in the skull which is responsible for perception, cognition, attention, memory, emotion, and action.
  3. 3
    The control center of the central nervous system of an animal located in the skull which is responsible for perception, cognition, attention, memory, emotion, and action.
  4. 4
    Mind.
  5. 5
    Intellect.
  6. 6
    An intelligent person.
  7. 7
    An intelligent person.
  8. 8
    An intelligent person.
  9. 9
    By analogy with a human brain, the part of a machine or computer that performs calculations.
  10. 10
    Oral sex.
  11. 11
    A loose compartment of a backpack that straps on over the top opening.

Recorded use

Wiktionary examples

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

  1. The Ueynes are ſpred foorth throughout the whole bodie, howbeit from one welhead, that is to ſay from the Liuer: ſo be the Sinews, howbeit from the Brayne; So likewiſe are the Heartſtrings, howbeit from the Heart.
  2. The brain of a calf, sheep, and pig, young and served fresh, is reputedly erotic in its effects.

Etymology

From Middle English brayn, brain, from Old English bræġn (“brain”), from Proto-West Germanic *bragn, from Proto-Germanic *bragną (“brain”), from Proto-Indo-European *mregʰnom (“skull, brain”), from Proto-Indo-European *mregʰ- (“marrow, sinciput”) + *-mn̥ (“nominal suffix”). Cognate with Scots braine, brane (“brain”), North Frisian brayen, brein, Brain (“brain”), Saterland Frisian Brainge, Bräienge (“brain”), West Frisian brein (“brain”), Dutch brein (“brain”), Low German Brägen, Bregen (“brain”) (whence German Bregen (“animal brain”)), Ancient Greek βρεχμός (brekhmós, “front part of the skull, top of the head”).

Synonyms

brainencephalonharns

This word in other languages

cerebro(Español)cerveau(Français)Gehirn(Deutsch)cérebro(Português)

Common misspellings

Also misspelled as:

  • barin
  • bbrain
  • brainn
  • brani
  • brrain
  • rbain

Misspelling Pattern Breakdown

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

barin2bbrain1brainn1brani2brrain1rbain2
Edit distance from "brain"

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 "brain"?
"brain" is spelled B-R-A-I-N. The IPA pronunciation is /bɹeɪn/.
What does "brain" mean?
As a noun, "brain" means: The control center of the central nervous system of an animal located in the skull which is responsible for perception, cognition, attention, memory, emotion, and action.
What words are commonly confused with "brain"?
"brain" is commonly confused with "Bri", "Brit", "brat". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "brain"?
The IPA (International Phonetic Alphabet) transcription for "brain" is /bɹeɪn/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "brain"?
From Middle English brayn, brain, from Old English bræġn (“brain”), from Proto-West Germanic *bragn, from Proto-Germanic *bragną (“brain”), from Proto-Indo-European *mregʰnom (“skull, brain”), from Proto-Indo-European *mregʰ- (“marrow, sinciput”) ... 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 "brain", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 5 letters (nearest by frequency rank).

floor#1,221image#1,225meant#1,228named#1,199

Similar misspelling depth

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

annual6 variantshurt6 variantsplus6 variantslady6 variants

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

Source: FrequencyWords open word-frequency list