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blue devil

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noun Slang.
  1. blue heaven.

blue heaven

noun Slang.
  1. a blue capsule or tablet containing the barbiturate amobarbital or its derivative.
Also called blue angel, blue devil.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
blue devil's in Medicine

blue devil

n.
  1. A blue capsule or tablet containing barbiturate amobarbital or its sodium derivative.
  2. A feeling of depression; despondency.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.