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blue pill

noun, Pharmacology
a pill of blue mass, used in medicine chiefly as a cathartic.
Also called mercury mass.
Origin of blue pill
1785-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for blue-pill
Historical Examples
  • The time will come, we may hope, when doctors will prescribe bird-gazing instead of blue-pill.

    Birds in the Bush Bradford Torrey

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