We found 3 dictionaries that define the word warning lights:

General (2 matching dictionaries)

1. warning lights: Collins English Dictionary
2. warning lights: Vocabulary.com

Miscellaneous (1 matching dictionary)

3. Encyclopedia of Graphic Symbols (No longer online)

(Note: See warning_light as well.)

Definitions from WordNet (warning light) ▸ noun:  a cautionary sign of danger ▸ Also see warning_light Phrases: hazard warning lights, more... ▸ Words similar to warning lights ▸ Usage examples for warning lights ▸ Idioms related to warning lights ▸ Wikipedia articles (New!) ▸ Words that often appear near warning lights ▸ Rhymes of warning lights ▸ Invented words related to warning lights