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blue devil

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noun Slang.
  1. blue heaven.
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blue devils

plural noun
  1. low spirits; depression.
  2. delirium tremens.
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Origin of blue devils

First recorded in 1780–90

blue heaven

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

British Dictionary definitions for blue devil

blue devils

pl n
  1. a fit of depression or melancholy
  2. an attack of delirium tremens
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

blue devil in Medicine

blue devil

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