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medical marker

noun
  1. a trait, condition, etc that indicates the presence of, or a probable increased predisposition towards, a medical or psychological disorder
  2. a pen or an inklike substance used in medicine, for example to mark on a surgical patient the places where incisions are to be made
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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