octahedron

noun

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

"octahedron" is a 10-letter English headword indexed on PlainSpell.

The verdict

“octahedron” is uncommon English (frequency #85,594 among 1,431 “O” headwords), classed as a noun. The kind of spelling people second-guess.

#85,594
frequency rank, English
1,431
“O” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - a polyhedron with eight faces; the regular octahedron has regular triangles as faces and is one of the Platonic solids.

Corpus desk

Index EN-octahedron · octahedron · English

octahedron · rank #85,594 · 0 variants · 0 confusables

  • FREQ-RARE #85,594
  • LEN-MEGA 10 letters
  • VOW-4 4 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 1,431
  • PHOTO-FINISH obvi

Nearest frequency peer: obvi (-1 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 “octahedron”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

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

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for octahedron
PropertyValue
Headwordoctahedron
LanguageEnglish
Part of speechNoun
Letters10
Frequency rank#85,594
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “octahedron” 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).octahedronfalls in this rarity band:

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

Scale is logarithmic (each tick is 10× rarer). Rare peers in the same band: “obvi” (#85,593), “nyah” (#85,592), “NSPCC” (#85,588). Among 1,431 “O” headwords, “octahedron” is #85,594. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

octahedron is uncommon English at frequency #85,594 among 1,431 “O” headwords, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "a polyhedron with eight faces; the regular octahedron has regular triangles as faces and is one of the Platonic solids.".

No generated misspelling entries exist for octahedron in our index, since its letter sequence doesn't invite the usual edit-distance slips. No close-neighbour confusable shows up for this headword in our dataset, since its spelling is unusual enough that it doesn't cluster with a lookalike.

Etymologically, the entry records: From Ancient Greek ὀκτάεδρον (oktáedron). By surface analysis, octa- + -hedron. The correct English form is octahedron, spelled O-C-T-A-H-E-D-R-O-N.

Definition

  1. 1
    a polyhedron with eight faces; the regular octahedron has regular triangles as faces and is one of the Platonic solids.

Etymology

From Ancient Greek ὀκτάεδρον (oktáedron). By surface analysis, octa- + -hedron.

This word in other languages

octaedro(Español)octaèdre(Français)Oktaeder(Deutsch)octaedro(Português)

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 "octahedron"?
"octahedron" is spelled O-C-T-A-H-E-D-R-O-N.
What does "octahedron" mean?
As a noun, "octahedron" means: a polyhedron with eight faces; the regular octahedron has regular triangles as faces and is one of the Platonic solids.
What is the origin of the word "octahedron"?
From Ancient Greek ὀκτάεδρον (oktáedron). By surface analysis, octa- + -hedron. 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 "octahedron", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 10 letters (nearest by frequency rank).

paraplegia#85,625perfidious#85,638multifocal#85,545picaresque#85,648

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

Source: FrequencyWords open word-frequency list