medical certificate

noun
  1. a document stating the result of a satisfactory medical examination
  2. a doctor's certificate giving evidence of a person's unfitness for work
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