blue hour
/ˈbluː aʊə/
"blue-hour" is a 8-letter English headword indexed on PlainSpell.
The verdict
“blue hour” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 9
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The period of twilight when the Sun is approximately 4-8° below the horizon and the sky is within a range of blue colors.
| Property | Value |
|---|---|
| Headword | blue hour |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈbluː aʊə/ |
| Letters | 9 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “blue hour” sits in English frequency
Rare enough to double-check
blue hour is uncommon English outside the top frequency list, classed as anoun, transcribed /ˈbluː aʊə/. Rarity is why readers land here mid-draft. Gloss: "The period of twilight when the Sun is approximately 4-8° below the horizon and the sky is within a range of blue colors.".
Zero misspellings are on record for blue hour in our index, typically a sign the spelling maps closely to how the word sounds. No confusable counterpart is on file for this word, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.
Etymologically, the entry records: Calque of French heure bleue. The correct English form is blue hour, spelled B-L-U-E- -H-O-U-R.
Definition
- 1The period of twilight when the Sun is approximately 4-8° below the horizon and the sky is within a range of blue colors.
Etymology
Calque of French heure bleue.
Synonyms
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 "blue hour"?
What does "blue hour" mean?
How do you pronounce "blue hour"?
What is the origin of the word "blue hour"?
Is PlainSpell free to use?
Using “blue hour”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is B-L-U-E- -H-O-U-R - every other letter order is a misspelling in standard orthography.
- Say it as /ˈbluː aʊə/ (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
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.