Our online medical glossary of medical terms and definitions includes definitions for terms related to treatment, and general medicine
PATHOGNOMONIC
Specially or decisively quality of a malady; indicating with certainty a malady; as, a pathognomonic symptom. "The true pathognomonicsign of love jealousy." (Arbuthnot)
Origin: Gr. Skilled in judging of illness; a malady + skilled: cf. F. Pathognomonique. See Gnomic.
Source: Websters Vocabulary