endothermic
/ˌɛndəʊˈθəːmɪk/
"endothermic" is a 11-letter English headword indexed on PlainSpell.
The verdict
“endothermic” is uncommon English (frequency #89,328 among 18,836 “E” headwords), classed as an adjective. The kind of spelling people second-guess.
- #89,328
- frequency rank, English
- 18,836
- “E” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Of a chemical reaction that absorbs heat energy from its surroundings.
| Property | Value |
|---|---|
| Headword | endothermic |
| Language | English |
| Part of speech | Adjective |
| IPA | /ˌɛndəʊˈθəːmɪk/ |
| Letters | 11 |
| Frequency rank | #89,328 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “endothermic” sits in English frequency
Rare enough to double-check
endothermic is uncommon English at frequency #89,328 among 18,836 “E” headwords, classed as anadjective, transcribed /ˌɛndəʊˈθəːmɪk/. Rarity is why readers land here mid-draft. 2 senses are on record.
Our edit-distance generator produced no likely misspellings for endothermic, suggesting the orthography follows predictable English patterns. Our confusable-pair dataset has no match for it, since no other headword is close enough in sound or shape to pair with it.
Etymologically, the entry records: Borrowed from French endothermique, from endo- (“inside”) + thermique (“of heat”), both ultimately from Ancient Greek. By surface analysis, endo- + -thermic. The correct English form is endothermic, spelled E-N-D-O-T-H-E-R-M-I-C.
Definition
- 1Of a chemical reaction that absorbs heat energy from its surroundings.
- 2Of an animal whose body temperature is regulated by internal factors.
Etymology
Borrowed from French endothermique, from endo- (“inside”) + thermique (“of heat”), both ultimately from Ancient Greek. By surface analysis, endo- + -thermic.
This word in other languages
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
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Using “endothermic”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is E-N-D-O-T-H-E-R-M-I-C - every other letter order is a misspelling in standard orthography.
- Say it as /ˌɛndəʊˈθəːmɪk/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Browse more English words and confusable pairs in the same reference. English words
Other uncommon English words near this rank
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.