n. [ See Pathogenic. ] (Biol.) Any microorganism which causes disease; a pathogenic organism; an infectious microorganism; a bacterium, virus, or other agent which can cause disease by infection; -- opposed to zymogene. The spelling pathogene is now archaic. [ 1913 Webster + PJC ]

n. (Med.) Pathogeny. [ 1913 Webster ]

a. (Med.) Pathogenic. [ 1913 Webster ]

a. [ Gr. pa`qos disease + the root of ge`nos birth. ] (Med. & Biol.) Of or pertaining to pathogeny; producting disease; as, a pathogenic organism; a pathogenic bacterium. [ 1913 Webster ]

n. (Med.) (a) The generation, and method of development, of disease; as, the pathogeny of yellow fever is unsettled. (b) That branch of pathology which treats of the generation and development of disease. [ 1913 Webster ]

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 ]

n. [ Gr. &unr_; passion + &unr_; a judgment, fr. &unr_;, &unr_;, to know. ] Expression of the passions; the science of the signs by which human passions are indicated. [ 1913 Webster ]

{ } a. [ Gr. &unr_;: cf. F. pathologique. ] 1. Of or pertaining to pathology. [ 1913 Webster ]

2. (Med.) caused by or due to disease; abnormal; morbid; as, pathological tissue; a pathological condition. [ Webster 1913 Suppl. ]

-- Path`o*log"ic*al*ly, adv. [1913 Webster]

n. [ Cf. F. pathologiste. ] One skilled in pathology; an investigator in pathology; as, the pathologist of a hospital, whose duty it is to determine the causes of the diseases. [ 1913 Webster ]

n.; pl. pathologies [ Gr. pa`qos a suffering, disease + -logy: cf. F. pathologie. ] 1. (Med.) The science which treats of diseases, their nature, causes, progress, symptoms, etc. [ 1913 Webster ]

☞ Pathology is general or special, according as it treats of disease or morbid processes in general, or of particular diseases; it is also subdivided into internal and external, or medical and surgical pathology. Its departments are nosology, ætiology, morbid anatomy, symptomatology, and therapeutics, which treat respectively of the classification, causation, organic changes, symptoms, and cure of diseases. [ 1913 Webster ]

2. (Med.) The condition of an organ, tissue, or fluid produced by disease. [ Webster 1913 Suppl. ]

Celluar pathology, a theory that gives prominence to the vital action of cells in the healthy and diseased functions of the body. Virchow. [ 1913 Webster ]