'blue devil' definitions:
Definition of 'blue devil'
(from WordNet)
noun
A coarse prickly European weed with spikes of blue flowers; naturalized in United States [syn: blueweed, blue devil, blue thistle, viper's bugloss, Echium vulgare]
noun
The sodium salt of amobarbital that is used as a barbiturate; used as a sedative and a hypnotic [syn: amobarbital sodium, blue, blue angel, blue devil, Amytal]