noun
- A coarse prickly European weed with spikes of blue flowers; naturalized in United States.
- synonyms: blueweed, blue devil, blue thistle, viper's bugloss, Echium vulgare
- The sodium salt of amobarbital that is used as a barbiturate; used as a sedative and a hypnotic.
- synonyms: amobarbital sodium, blue, blue angel, blue devil, Amytal
- A state of depression.
- usage: "he had a bad case of the blues"
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). blue devils. Retrieved September 20, 2026, from http://smartdefine.org/blue_devils/definitions/1260876 |
| Chicago | WordNet. 2010. "blue devils" http://smartdefine.org/blue_devils/definitions/1260876 (accessed September 20, 2026). |
| Harvard | WordNet 2010, blue devils, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/blue_devils/definitions/1260876>. |
| MLA | WordNet. "blue devils" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/blue_devils/definitions/1260876> |