pathognomonic

adj

1. (not-comparable)specifically characteristic or indicative of a particular disease or condition.

   “A tetrad of rash, arthralgia, abdominal pain and kidney disease in a child is pathognomonic for Henoch-Schönlein purpura.”

   “high involvement in internet-related behaviors is likely not pathognomonic for addiction and may stem from comorbid disorders (e.g., mood disorders, anxiety disorders, attention-deficit and hyperactivity disorder).”