|pathə̇(g)nə|mänik adjective
also path·og·no·mon·i·cal -nə̇kəl
Etymology: Greek pathognōmonikos indicating a particular disease, from patho- path- + gnōmonikos fit to judge, from gnōmon-, gnōmōn one that knows or discerns, interpreter + -ikos -ic, -ical — more at gnomon
: specially, distinctively, or decisively characteristic of a particular disease
a pathognomonic symptom
• path·og·no·mon·i·cal·ly -nə̇k(ə)lē adverb