longueur de Planck
\lɔ̃.ɡœʁ də plɑ̃k\
The verdict
“longueur de Planck” is outside the top-ranked French vocabulary, used as a noun - the kind of word writers most often double-check.
- Unranked
- below top-frequency French
- 18
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Unité de longueur définie uniquement en termes des constantes fondamentales de la relativité, de la gravitation et de la mécanique quantique (elle vaut environ 1,616 10⁻³⁵ mètre).
| Property | Value |
|---|---|
| Headword | longueur de Planck |
| Language | French |
| Part of speech | Noun |
| IPA | \lɔ̃.ɡœʁ də plɑ̃k\ |
| Letters | 18 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “longueur de Planck” sits in French frequency
Spelling & Dictionary Insight
The French entry for longueur de Planck is 18 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as \lɔ̃.ɡœʁ də plɑ̃k\. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. The dominant gloss from Wiktionary reads: "Unité de longueur définie uniquement en termes des constantes fondamentales de la relativité, de la gravitation et de la mécanique quantique (elle vaut environ 1,616 10⁻³⁵ mètre).".
No misspelling variants are generated for longueur de Planck in our index, suggesting the orthography follows predictable French patterns. It is not paired with a close-neighbour confusable in our dataset, which tends to mean the word is visually distinctive enough to stand on its own.
No explicit etymology string is stored for this entry, so spelling patterns must be inferred from the word's phoneme-to-grapheme mapping rather than from a documented borrowing chain. For readers arriving here from a spelling check, the authoritative guidance is: the correct French form is longueur de Planck, spelled L-O-N-G-U-E-U-R- -D-E- -P-L-A-N-C-K, and any other sequence of those letters, regardless of how natural it feels, is a misspelling in standard orthography.
Definition
- 1Unité de longueur définie uniquement en termes des constantes fondamentales de la relativité, de la gravitation et de la mécanique quantique (elle vaut environ 1,616 10⁻³⁵ mètre).
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). See the methodology for how each field is sourced and updated.
Cite this page
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PlainSpell, “longueur de Planck, French word data” (May 6, 2026). Derived from Wiktionary (kaikki.org, CC BY-SA) and an open word-frequency list. https://plainspell.com/fr/mot/longueur-de-planck
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Using “longueur de Planck”
The practical upshot for anyone who landed here from a spell-check.
- The one correct French spelling is L-O-N-G-U-E-U-R- -D-E- -P-L-A-N-C-K - every other letter order is a misspelling in standard orthography.
- Say it as \lɔ̃.ɡœʁ də plɑ̃k\ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Browse more French words and confusable pairs in the same reference. French words
Nearby French words
Other entries that begin with the letter L in our French index: