firefly

F4I1R1E1F4L1Y4
UK/ˈfaɪ.əˌflaɪ/US/ˈfaɪ.ɚˌflaɪ/

noun

Any beetle of the family Lampyridae, which exhibit bioluminescence during twilight.

Less commonScrabble 16

Meanings

firefly1

nounfirefly (plural fireflies)

plural fireflies · alternative fire-fly

  1. FloridaNorthern USUSWesternAny beetle of the family Lampyridae, which exhibit bioluminescence during twilight.

    2000, Exploring Life Science, 2: Bats—Cave Life, Marshall Cavendish, page 96, Fireflies are the best-known insects that produce light. […] Many fireflies use their light to communicate, particularly at mating time when males and females have to get together.

    2 more examples

    The luciferins are different in different species and today both the luciferin and luciferase in the firefly are available in the crystalline form.

    2004, B. V. David, T. N. Ananthakrishnan, “Chapter 20: Bioluminescence”, in General and Applied Entomology, 2nd edition, Tata McGraw-Hill, page 130

    Various other luciferase genes, especially the firefly luciferase gene, are also used for the study of gene regulation.[…]The classic use of bioluminescence, however, is the use of a luciferin-luciferase mixture from fireflies as an assay for ATP.

    2007, Lars Olof Björn, Helen Ghiradella, “23: Bioluminescence”, in Lars Olof Björn, editor, Photobiology: The Science of Life and Light, 2nd edition, Springer, page 607

    Synonyms: lightning beetle, lightning bug, glow fly

Firefly2

proper noun
  1. A locality in the MidCoast council area, eastern New South Wales, Australia.

Synonyms & antonyms

nounAny beetle of the family Lampyridae, which exhibit bioluminescence during twilight.

More synonyms by meaning

nountropical American click beetle having bright luminous spots

Similar
fire beetlePyrophorus noctiluca
Broader
elaterid beetleelaterelaterid

nounnocturnal beetle common in warm regions having luminescent abdominal organs

Broader

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

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)).

Full word history & related roots →

Translations

Afrikaans glimwurm, vuurvlieg
  • glimwurmLampyridae
  • vuurvliegLampyridae
Arabic يَرَاعَة, حُبَاحِب
  • يَرَاعَة (yarāʕa)Lampyridae
  • حُبَاحِب (ḥubāḥib)Lampyridae
Basque euli ipurtargi
  • euli ipurtargiLampyridae
Bengali জোনাকি, জুনি
  • জোনাকি (jōnaki)Lampyridae
  • জুনি (juni)Lampyridae
  • জুনিপোকা (junipōka)Lampyridae
  • জ্যোতিরিঙ্গ (jōtiriṅgo)Lampyridae
  • জ্যোতিরিঙ্গণ (jōtiriṅgon)Lampyridae
  • খজ্যোতি (khojjōti)Lampyridae
  • খদ্যোত (khoddōt)Lampyridae
Bulgarian свету́лка
  • свету́лка (svetúlka)Lampyridae
Catalan lluerna, cuca de llum
  • lluernaLampyridae
  • cuca de llumLampyridae
Chinese Cantonese 螢火蟲 /萤火虫
  • 螢火蟲 /萤火虫 (jing⁴ fo² cung⁴)Lampyridae
Chinese Mandarin 螢火蟲 /萤火虫
  • 螢火蟲 /萤火虫 (yínghuǒchóng)Lampyridae
Czech světluška
  • světluškaLampyridae
Danish ildflue
  • ildflueLampyridae
Dutch glimworm, vuurvlieg
  • glimwormLampyridae
  • vuurvliegLampyridae
Esperanto fulgoro
  • fulgoroLampyridae
Estonian jaanimardikas
  • jaanimardikasLampyridae
Finnish kiiltomato, tulikärpänen
  • kiiltomatoLampyridae
  • tulikärpänenLampyridae
French luciole, mouche à feu
  • lucioleLampyridae
  • mouche à feuLampyridae
  • moiselleLampyridae
  • ver luisantLampyridae
German Glühwürmchen, Leuchtkäfer
  • GlühwürmchenLampyridae
  • LeuchtkäferLampyridae
  • JohanniswürmchenLampyridae
Greek πυγολαμπίδα, κωλοφωτιά
  • πυγολαμπίδα (pygolampída)Lampyridae
  • κωλοφωτιά (kolofotiá)Lampyridae
Hawaiian nalo ʻuiʻuiki
  • nalo ʻuiʻuikiLampyridae
Hebrew גַּחְלִילִית
  • גַּחְלִילִית (gaẖlilít)Lampyridae
Hindi ज्योतिरिंगण, खद्योत
  • ज्योतिरिंगण (jyotiriṅgaṇ)Lampyridae
  • खद्योत (khadyot)Lampyridae
  • जुगनू (jugnū)Lampyridae
Hungarian szentjánosbogár
  • szentjánosbogárLampyridae
Icelandic eldfluga, blysbjalla
  • eldflugaLampyridae
  • blysbjallaLampyridae
  • glætuflugaLampyridae
  • glóbjallaLampyridae
  • ljósormurLampyridae
  • ljósbjallaLampyridae
Indonesian kunang-kunang
  • kunang-kunangLampyridae
Irish lampróg, tinechuileog
  • lamprógLampyridae
  • tinechuileogLampyridae
Italian lucciola
  • lucciolaLampyridae
Japanese 蛍, ホタル
  • 蛍 (hotaru)Lampyridae
  • ホタル (hotaru)Lampyridae
Korean 개똥벌레, 반딧불
  • 개똥벌레 (gaettongbeolle)Lampyridae
  • 반딧불 (banditbul)Lampyridae
  • 반딧불이 (banditburi)Lampyridae
Latin cicindēla
  • cicindēlaLampyridae
Latvian jāņtārpiņš
  • jāņtārpiņšLampyridae
Lithuanian jõnvabalis, žibukas
  • jõnvabalisLampyridae
  • žibukasLampyridae
Malay kelip-kelip, kunang-kunang
  • kelip-kelipLampyridae
  • kunang-kunangLampyridae
Māori titiwai
  • titiwaiLampyridae
Norwegian Bokmål lysbille, ildflue
  • lysbilleLampyridae
  • ildflueLampyridae
Persian کرم شبتاب
  • کرم شبتاب (kerm-e šab-tâb)Lampyridae
Polish świetlik, robaczek świętojański
  • świetlikLampyridae
  • robaczek świętojańskiLampyridae
Portuguese vaga-lume, pirilampo
  • vaga-lumeLampyridae
  • pirilampoLampyridae
  • vagalumeLampyridae
Punjabi ਜੁਗਨੂਂ
  • ਜੁਗਨੂਂ (jugnū̃)Lampyridae
Romanian licurici
  • licuriciLampyridae
Russian светля́к, светлячо́к
  • светля́к (svetlják)Lampyridae
  • светлячо́к (svetljačók)Lampyridae
Slovak svetluška
  • svetluškaLampyridae
Spanish luciérnaga
  • luciérnagaLampyridae
Swahili kimetameta
  • kimetametaLampyridae
Swedish lysmask
  • lysmaskLampyridae
Tagalog alitaptap
  • alitaptapLampyridae
Tamil மின்மினிப்பூச்சி, கீடமணி
  • மின்மினிப்பூச்சி (miṉmiṉippūcci)Lampyridae
  • கீடமணி (kīṭamaṇi)Lampyridae
  • ஞலவல் (ñalaval)Lampyridae
  • மின்மினி (miṉmiṉi)Lampyridae
Thai หิ่งห้อย
  • หิ่งห้อย (hìng-hɔ̂i)Lampyridae
Turkish ateş böceği
  • ateş böceğiLampyridae
Ukrainian світля́к, світлячо́к
  • світля́к (svitlják)Lampyridae
  • світлячо́к (svitljačók)Lampyridae
Urdu جگنو
  • جگنو (jugnū)Lampyridae
Vietnamese đom đóm, huỳnh
  • đom đómLampyridae
  • huỳnhLampyridae
Welsh pryf tân, magïen
  • pryf tânLampyridae
  • magïenLampyridae
Yiddish גליװאָרעם
  • גליװאָרעם (glivorem)Lampyridae
Zulu ukhanyikhanyi class 1a/2a
  • ukhanyikhanyi class 1a/2aLampyridae
Cite this entry
APA

firefly. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/firefly

MLA

“firefly.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/firefly. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “firefly,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/firefly.

Source: firefly on Wiktionary, CC BY-SA 4.0.