firefly
/ˈfaɪ.ɚˌflaɪ/noun
firefly is spelled F-I-R-E-F-L-Y: 7 letters and 3 syllables. It appears 1.3 times per million words in written English, the 24,463rd most frequent word form (wordfreq, 2021 data). As a noun, firefly means “Any beetle of the family Lampyridae, which exhibit bioluminescence during twilight” (English Wiktionary, September 2026). The plural of firefly is fireflies.
How many letters and syllables are in firefly?
| Letters | 7: F-I-R-E-F-L-Y |
|---|---|
| Syllables | 3 (from its American pronunciation) |
| In writing | 1.3 times per million words; the 24,463rd most frequent word form |
| Wrong spellings searched | none measured in search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How common is firefly?
Firefly appears 1.3 times per million words in written English, the 24,463rd most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce firefly?
- UK /ˈfaɪ.əˌflaɪ/
- US /ˈfaɪ.ɚˌflaɪ/
Firefly has 3 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-firefly.wav, Wikimedia Commons (author and licence on each file's page).
Words people confuse with firefly
Also written: fire-fly (one word or two).
Sources: English Wiktionary (homophones, alternative spellings).
Forms of firefly
- fireflies plural
- fire-fly
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does firefly mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
USAny beetle of the family Lampyridae, which exhibit bioluminescence during twilight.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Firefly in Spanish, French, German and Portuguese
In the sense Lampyridae:
| Language | Words |
|---|---|
| French | luciole, mouche à feu, moiselle, ver luisant |
| German | Glühwürmchen, Leuchtkäfer, Johanniswürmchen |
| Portuguese | vaga-lume, pirilampo, vagalume |
| Spanish | luciérnaga |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does firefly come from?
Endocentric compound of fire + fly, because the insects glow; whence also lightning bug. Compare glow fly, glowworm, and lanternfly. Compare typologically Ancient Greek λαμπυρίς (lampurís, “glowworm”) (<+ πῦρ (pûr)).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).