pathognomonic

The story

1. Ancient Greek · derived fromπαθογνωμονικός“skilled in diagnosis”
2. English todaypathognomonic

From Ancient Greek παθογνωμονικός (pathognōmonikós, “skilled in diagnosis”), from πάθος (páthos, “misfortune”) + γνωμονικός (gnōmonikós, “fit to judge of”).