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Noun: blue devils
Usage: archaic
  1. A state of depression
    "he had a bad case of the blue devils";
    - blues, megrims, vapors [US], vapours [Brit, Cdn]
Noun: blue devil  bloo'de-vul
  1. A coarse prickly European weed with spikes of blue flowers; naturalized in United States
    "blue devil had taken over the abandoned field";
    - blueweed, blue thistle, viper's bugloss, Echium vulgare
     
  2. The sodium salt of amobarbital that is used as a barbiturate; used as a sedative and a hypnotic
    - amobarbital sodium, blue, blue angel, Amytal

Type of: amobarbital, depression, herb, herbaceous plant

Part of: Echium, genus Echium

Encyclopedia: Blue devils

Blue devil