tokamak

/ˈtəʊkəmæk/

//ˈtəʊkəmæk// noun

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

"tokamak" is a 7-letter English headword indexed on PlainSpell.

The verdict

“tokamak” is uncommon English (frequency #71,171 among 3,151 “T” headwords), classed as a noun. The kind of spelling people second-guess.

#71,171
frequency rank, English
3,151
“T” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A torus-shaped chamber used in nuclear fusion research in which a plasma is magnetically confined.

Corpus desk

Index EN-tokamak · tokamak · English

tokamak · rank #71,171 · 0 variants · 0 confusables

  • FREQ-RARE #71,171
  • LEN-LONG 7 letters
  • VOW-3 3 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 3,151
  • PHOTO-FINISH TMJ

Nearest frequency peer: TMJ (-2 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.

Long-tail ranks near “tokamak”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

What this shows Long-tail view: where “tokamak” sits against similarly uncommon English ranks.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for tokamak
PropertyValue
Headwordtokamak
LanguageEnglish
Part of speechNoun
IPA/ˈtəʊkəmæk/
Letters7
Frequency rank#71,171
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “tokamak” in English

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).tokamakfalls in this rarity band:

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

The axis is logarithmic, with each marked tick roughly ten times rarer than the last. Rare peers in the same band: “TMJ” (#71,169), “tipu” (#71,168), “toroidal” (#71,174). Among 3,151 “T” headwords, “tokamak” is #71,171. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

tokamak is uncommon English at frequency #71,171 among 3,151 “T” headwords, classed as anoun, transcribed /ˈtəʊkəmæk/. Rarity is why readers land here mid-draft. Gloss: "A torus-shaped chamber used in nuclear fusion research in which a plasma is magnetically confined.".

tokamak has no tracked misspelling variants, which points to an orthography that plays by predictable English rules. No close-neighbour confusable shows up for this headword in our dataset, which typically means the spelling is too distinctive to be mistaken for another word.

Etymologically, the entry records: Borrowed from Russian токама́к (tokamák), an acronym of то(роида́льная) ка́(мера) (с) ма(гни́тными) к(ату́шками) (to(roidálʹnaja) ká(mera) (s) ma(gnítnymi) k(atúškami), “toroidal chamber with magnetic coils”). The correct English form is tokamak, spelled T-O-K-A-M-A-K.

Definition

  1. 1
    A torus-shaped chamber used in nuclear fusion research in which a plasma is magnetically confined.

Recorded use

Wiktionary examples

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

  1. Studies of electrodeless discharges in a strong longitudinal magnetic field, carried out on the stellarator and the "Tokamak", have shown that in such systems the plasma becomes unstable for currents appreciably les than the critical current of Shafranov-Kruskal.
  2. A Tokamak engineering test reactor (TETR) will be an important component of any national or international program to achieve viable Tokamak fusion power reactors.

Etymology

Borrowed from Russian токама́к (tokamák), an acronym of то(роида́льная) ка́(мера) (с) ма(гни́тными) к(ату́шками) (to(roidálʹnaja) ká(mera) (s) ma(gnítnymi) k(atúškami), “toroidal chamber with magnetic coils”).

This word in other languages

tokamak(Français)

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 "tokamak"?
"tokamak" is spelled T-O-K-A-M-A-K. The IPA pronunciation is /ˈtəʊkəmæk/.
What does "tokamak" mean?
As a noun, "tokamak" means: A torus-shaped chamber used in nuclear fusion research in which a plasma is magnetically confined.
How do you pronounce "tokamak"?
The IPA (International Phonetic Alphabet) transcription for "tokamak" is /ˈtəʊkəmæk/. 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 "tokamak"?
Borrowed from Russian токама́к (tokamák), an acronym of то(роида́льная) ка́(мера) (с) ма(гни́тными) к(ату́шками) (to(roidálʹnaja) ká(mera) (s) ma(gnítnymi) k(atúškami), “toroidal chamber with magnetic coils”). 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 "tokamak", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 7 letters (nearest by frequency rank).

taxiway#71,151Talbert#71,146usefull#71,199vicomte#71,208

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

Source: FrequencyWords open word-frequency list