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BLUE DEVIL

Definition:

[noun] a coarse prickly European weed with spikes of blue flowers; naturalized in United States
Synonyms: blueweed, 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
Synonyms: amobarbital sodium, blue, blue angel, Amytal