ketosis

/kiːˈtəʊsɪs/

//kiːˈtəʊsɪs// noun

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

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

The verdict

“ketosis” is uncommon English (frequency #59,487 among 1,236 “K” headwords), classed as a noun. The kind of spelling people second-guess.

#59,487
frequency rank, English
1,236
“K” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A metabolic state in which the body produces ketones to be used as fuel by some organs so that glycogen can be reserved for organs that depend on it. This condition occurs during times of fasting, ...

Corpus desk

Index EN-ketosis · ketosis · English

ketosis · rank #59,487 · 0 variants · 0 confusables

  • FREQ-RARE #59,487
  • LEN-LONG 7 letters
  • VOW-3 3 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 1,236
  • PHOTO-FINISH Kehoe

Nearest frequency peer: Kehoe (-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.

Frequency neighbourhood for “ketosis”

Lower corpus rank = more everyday usage (inverted bar length for readability)

corpus weight

What this shows Bars show where “ketosis” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for ketosis
PropertyValue
Headwordketosis
LanguageEnglish
Part of speechNoun
IPA/kiːˈtəʊsɪs/
Letters7
Frequency rank#59,487
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “ketosis” sits in English frequency

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).ketosislands 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 “Kehoe” (#59,485), “Kearny” (#59,484), “Kharkov” (#59,490). Source: FrequencyWords open word-frequency list.

Rare enough to double-check

ketosis is uncommon English at frequency #59,487 among 1,236 “K” headwords, classed as anoun, transcribed /kiːˈtəʊsɪs/. Rarity is why readers land here mid-draft. Gloss: "A metabolic state in which the body produces ketones to be used as fuel by some organs so that glycogen can be reserved for organs that depend on it. This condition occurs during times of fasting, ...".

Zero misspellings are on record for ketosis in our index, which points to an orthography that plays by predictable English rules. Our dataset records no confusable match here, since nothing in our dataset looks or sounds close enough to cause mix-ups.

Etymologically, the entry records: From keto- + -osis. The correct English form is ketosis, spelled K-E-T-O-S-I-S.

Definition

  1. 1
    A metabolic state in which the body produces ketones to be used as fuel by some organs so that glycogen can be reserved for organs that depend on it. This condition occurs during times of fasting, starvation, or while on a ketogenic diet.

Etymology

From keto- + -osis.

This word in other languages

cetosis(Español)

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 "ketosis"?
"ketosis" is spelled K-E-T-O-S-I-S. The IPA pronunciation is /kiːˈtəʊsɪs/.
What does "ketosis" mean?
As a noun, "ketosis" means: A metabolic state in which the body produces ketones to be used as fuel by some organs so that glycogen can be reserved for organs that depend on it. This condition occurs during times of fasting, ...
How do you pronounce "ketosis"?
The IPA (International Phonetic Alphabet) transcription for "ketosis" is /kiːˈtəʊsɪs/. 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 "ketosis"?
From keto- + -osis. 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 "ketosis", not the corpus desk frequency band.

Same letter count

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

Kharkov#59,490Landsat#59,498linseed#59,511inboard#59,462

What to do next

You've looked up "ketosis". Here's where to go from here.

  • Usage frequency rank #59,487 among English headwords in this corpus. Corpus statistics
  • Browse more English words in the "K" letter cohort. K–Z browse
  • PlainSpell rotates a curated Word of the Day from the English corpus, a passive way to discover vocabulary. Word of the Day

PlainSpell is a reference corpus, not spelling advice. Verify unusual forms in context.

Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

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

Source: FrequencyWords open word-frequency list