pathognomic
/ˌpaθəɡˈnɒmɪk/adjective
1Of or relating to the manifestation of the emotions, especially in the face. Compare pathognomy. Now rare.
2 Medicine. Specifically characteristic or indicative of a particular disease or disorder; = pathognomonic. With of, for.
Origin
Late 17th century; earliest use found in Samuel Pordage (bap. 1633, d. c1691), poet and translator. From post-classical Latin pathognomicus relating to the recognition of a particular disease from Hellenistic Greek παθογνωμικός (isolated attestation in Galen; also in a Byzantine medical writer), shortened from παθογνωμονικός.