fissible

\fi.sibl\

/\fi.sibl\/ adj

The verdict

“fissible” is uncommon French (outside the top frequency list), classed as an adjective. The kind of spelling people second-guess.

Unranked
below top-frequency French
8
letters

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Se dit d’un nucléide susceptible de subir une fission sous l’effet de neutrons d’énergie supérieure à son seuil de fission.

Corpus desk

Index FR-fissible · fissible · French

fissible · unranked · 0 variants · 0 confusables

  • FREQ-UNRANKED Unranked
  • LEN-LONG 8 letters
  • VOW-3 3 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-THIN "F" thin
  • PHOTO-UNK Peer pending

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.

Key facts for fissible
PropertyValue
Headwordfissible
LanguageFrench
Part of speechAdjective
IPA\fi.sibl\
Letters8
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Longue queue: rang de « fissible » en français

fissiblereste hors des 100.000 mots français les plus fréquents, dans la longue queue du vocabulaire technique, archaïque ou rare, là où le doute d'orthographe frappe.

Beyond rank #100,000. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

fissible is uncommon French outside the top frequency list, classed as anadjective, transcribed \fi.sibl\. Rarity is why readers land here mid-draft. 2 senses are on record.

The misspelling generator found no plausible variants for fissible, since its letter pattern doesn't lend itself to common typo substitutions. No confusable counterpart is on file for this word, since its spelling is unusual enough that it doesn't cluster with a lookalike.

No documented word history exists for this headword, so its spelling is easiest explained by how it's pronounced rather than where it came from. The correct French form is fissible, spelled F-I-S-S-I-B-L-E.

Definition

  1. 1
    Se dit d’un nucléide susceptible de subir une fission sous l’effet de neutrons d’énergie supérieure à son seuil de fission.
  2. 2
    Se dit de la matière qui contient de tels nucléides.

Recorded use

Wiktionary example

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

  1. Les densités élevées en neutrons qui sont engendrées dans les cœurs de ces réacteurs produisent de grandes quantités de radioisotopes, dont on doit tenir compte lorsque les barres d’uranium fissibles doivent être réapprovisionnées, c’est-à-dire à peu près une fois par an.

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.

Frequently Asked Questions

How do you spell "fissible"?
"fissible" is spelled F-I-S-S-I-B-L-E. The IPA pronunciation is \fi.sibl\.
What does "fissible" mean?
As an adjective, "fissible" means: Se dit d’un nucléide susceptible de subir une fission sous l’effet de neutrons d’énergie supérieure à son seuil de fission.
How do you pronounce "fissible"?
The IPA (International Phonetic Alphabet) transcription for "fissible" is \fi.sibl\. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What language does "fissible" come from?
"fissible" is a French word. You can look up definitions, pronunciations, and spelling data for this and other words across English, Spanish, Portuguese, French, and German on PlainSpell.
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.

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

Source: FrequencyWords open word-frequency list