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Definition of Blue devil
1. Noun. A coarse prickly European weed with spikes of blue flowers; naturalized in United States.
Exact synonyms: Blue Thistle, Blueweed, Echium Vulgare, Viper's Bugloss
Generic synonyms: Herb, Herbaceous Plant
Group relationships: Echium, Genus Echium
Generic synonyms: Herb, Herbaceous Plant
Group relationships: Echium, Genus Echium
2. Noun. The sodium salt of amobarbital that is used as a barbiturate; used as a sedative and a hypnotic.