Definition of "comorbid"

comorbid

adjective
not comparable
1. (medicine, of a disease or symptom) That occurs at the same time as another.
  Quotations
  Research shows that depression is often comorbid with other psychiatric and physical illnesses
  2000, Healthy People 2000‎
  They found that PTSD (50,3% men, 36.5% women), alcohol dependence (60.5% men, 8.1% women) and comorbid alcohol dependence and PTSD (69.6% men, 11.7% women) were common.
  2005, Mental Health Atlas 2005‎