a. [ Gr. &unr_; skilled in judging of diseases; pa`qos a disease + &unr_; skilled: cf. F. pathognomonique. See Gnomic. ] (Med.) Specially or decisively characteristic of a disease; indicating with certainty a disease; as, a pathognomonic symptom. [ 1913 Webster ]
The true pathognomonic sign of love jealousy. Arbuthnot. [ 1913 Webster ]