WordReference Random House Learner's Dictionary of American English © 2017
lau•da•num /ˈlɔdənəm/USA pronunciation   n. [uncountable]
  1. Drugsa drug made from opium.

WordReference Random House Unabridged Dictionary of American English © 2017
lau•da•num  (lôdn əm, lôdnəm),USA pronunciation n. 
  1. a tincture of opium.
  2. [Obs.]any preparation in which opium is the chief ingredient.
  • 1595–1605; origin, originally Medieval Latin variant of ladanum; arbitrarily used by Paracelsus to name a remedy based on opium

Collins Concise English Dictionary © HarperCollins Publishers::

laudanum /ˈlɔːdənəm/ n
  1. a tincture of opium
  2. (formerly) any medicine of which opium was the main ingredient
Etymology: 16th Century: New Latin, name chosen by Paracelsus for a preparation probably containing opium, perhaps based on labdanum

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