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An antidote against poison, especially a confection formerly held to be an antidote to all poisons.
[Medieval Latin mithridātum, alteration of Late Latin mithridātīum, from Latin, neuter of Mithridātīus, of Mithridates, from Greek mithridāteios, after Mithridates VIwho is said to have acquired tolerance for poison.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Alchemy) obsolete a substance believed to be an antidote to every poison and a cure for every disease
[C16: from Late Latin mithradatium, after Mithridates VI, alluding to his legendary immunity to poisons]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a medicinal preparation believed to contain an antidote to every poison.
[1520–30; derivative of Late Latin Mithridātēs Mithridates VI, said to have so immunized himself]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.