We found 6 dictionaries that define the word lightning bugs:

General (5 matching dictionaries)

1. lightning bugs: Merriam-Webster
2. lightning bugs: Collins English Dictionary
3. lightning bugs: Vocabulary.com
4. lightning bugs: Wiktionary
5. lightning bugs: TheFreeDictionary.com

Computing (1 matching dictionary)

6. lightning bugs: Encyclopedia

(Note: See lightning_bug as well.)

Definitions from Wiktionary (lightning bug) ▸ noun:  A firefly. ▸ Also see lightning_bug ▸ Words similar to lightning bugs ▸ Usage examples for lightning bugs ▸ Idioms related to lightning bugs ▸ Wikipedia articles (New!) ▸ Words that often appear near lightning bugs ▸ Rhymes of lightning bugs ▸ Invented words related to lightning bugs