cuboid

/ˈkjuːbɔɪd/

//ˈkjuːbɔɪd// adj

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

"cuboid" is a 6-letter English headword indexed on PlainSpell.

The verdict

“cuboid” is uncommon English (frequency #92,503 among 43,570 “C” headwords), classed as an adjective. The kind of spelling people second-guess.

#92,503
frequency rank, English
43,570
“C” headwords

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Of the shape of a cube.

Key facts for cuboid
PropertyValue
Headwordcuboid
LanguageEnglish
Part of speechAdjective
IPA/ˈkjuːbɔɪd/
Letters6
Frequency rank#92,503
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “cuboid” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). cuboid lands here:

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

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Rare enough to double-check

cuboid is uncommon English at frequency #92,503 among 43,570 “C” headwords, classed as anadjective, transcribed /ˈkjuːbɔɪd/. Rarity is why readers land here mid-draft. Gloss: "Of the shape of a cube.".

No misspelling variants are generated for cuboid in our index, which points to an orthography that plays by predictable English rules. No confusable counterpart is on file for this word, a sign it's visually distinctive enough not to be mixed up with another word.

Etymologically, the entry records: From cube + -oid. The correct English form is cuboid, spelled C-U-B-O-I-D.

Definition

  1. 1
    Of the shape of a cube.

Etymology

From cube + -oid.

This word in other languages

parallélépipèdique(Français)

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 "cuboid"?
"cuboid" is spelled C-U-B-O-I-D. The IPA pronunciation is /ˈkjuːbɔɪd/.
What does "cuboid" mean?
As an adjective, "cuboid" means: Of the shape of a cube.
How do you pronounce "cuboid"?
The IPA (International Phonetic Alphabet) transcription for "cuboid" is /ˈkjuːbɔɪd/. 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 "cuboid"?
From cube + -oid. 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.

Using “cuboid”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is C-U-B-O-I-D - every other letter order is a misspelling in standard orthography.
  • Say it as /ˈkjuːbɔɪd/ (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.

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

Source: FrequencyWords open word-frequency list