pathognomonic

adjective

1. Medicine/Medical. characteristic or diagnostic of a specific disease: a pathognomonic sign of pneumonia.

adjective

1. pathol characteristic or indicative of a particular disease

adj.1640s (implied in pathognomonical), from patho- “disease, suffering” + Greek gnomonikos “able to judge,” from gnomon “one who knows” (see gnomon). adj.

1. Characteristic or symptomatic of a particular disease or condition.