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Dram [dr]

The dram is a traditional unit of weight or volume, depending on context:

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  In weight (avoirdupois system):
  
  1 dram ≈ 1.772 grams

  
  
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  In volume (apothecaries’ system):
  
  1 fluid dram ≈ 3.696 milliliters (mL)

  
  

Used historically in medicine and pharmacy for measuring small quantities of substances.

Summary:

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  Weight dram ≈ 1.772 g

  
  
• 
  

  Fluid dram ≈ 3.696 mL

  
  
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  Common in pharmaceutical and historical contexts