The Britannica Dictionary
mobile search
Home
Ask the Editor
Word of the Day
Quizzes
Core Vocabulary
Browse the Dictionary
×
Britannica Homepage
Ask the Editor
Word of the Day
Quizzes
Core Vocabulary
Browse the Dictionary
The Britannica Dictionary
firefly
1 ENTRIES FOUND:
firefly
(noun)
firefly
/
ˈ
fajɚˌflaɪ/
noun
plural
fireflies
firefly
/
ˈ
fajɚˌflaɪ/
noun
plural
fireflies
Britannica Dictionary definition of FIREFLY
[
count
]
:
a small flying insect that produces a soft light
—
called also
(US)
lightning bug
ASK THE EDITOR
Does 'namely' have the same meaning as 'named'?
See the answer »
QUIZZES
Vocabulary Quiz
Test your word power
Take the Quiz »
Name That Thing
Take our visual quiz
Test Your Knowledge »
WORD OF THE DAY
emote
:
to express emotion in a very dramatic or obvious way
Learn More »