blue devil

nouns

a coarse prickly European weed with spikes of blue flowers; naturalized in United States
Echium vulgare, blue devil, blue thistle, blueweed, viper's bugloss
the sodium salt of amobarbital that is used as a barbiturate; used as a sedative and a hypnotic
Amytal, amobarbital sodium, blue, blue angel, blue devil