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[path-uh-juh n, ‐jen] /ˈpæθ ə dʒən, ‐ˌdʒɛn/

any disease-producing agent, especially a virus, bacterium, or other microorganism.
any agent that can cause disease

1880, a back-formation from pathogenic.

pathogen path·o·gen (pāth’ə-jən)
An agent that causes disease, especially a living microorganism such as a bacterium, virus, or fungus.
An agent that causes infection or disease, especially a microorganism, such as a bacterium or protozoan, or a virus. See Note at germ.
pathogen [(path-uh-juhn)]

A disease-causing agent. Microorganisms, viruses, and toxins are examples of pathogens.


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  • Pathogeny

    [path-uh-jen-uh-sis] /ˌpæθ əˈdʒɛn ə sɪs/ noun 1. the production and development of disease. /ˌpæθəˈdʒɛnɪsɪs/ noun 1. the origin, development, and resultant effects of a disease n. 1876, from patho- + genesis. pathogenesis path·o·gen·e·sis (pāth’ə-jěn’ĭ-sĭs) or pa·thog·e·ny (pā-thŏj’ə-nē) n. The development of a disease or morbid condition. Also called nosogenesis.

  • Pathognomonic symptom

    pathognomonic symptom n. A symptom that is a definitive indication of a certain disease or condition.

  • Pathognomonic

    [puh-thog-nuh-mon-ik] /pəˌθɒg nəˈmɒn ɪk/ adjective 1. Medicine/Medical. characteristic or diagnostic of a specific disease: a pathognomonic sign of pneumonia. /ˌpæθəɡnəˈmɒnɪk/ 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). pathognomonic pa·thog·no·mon·ic (pə-thŏg’nə-mŏn’ĭk, […]

  • Pathognomy

    [puh-thog-nuh-mee] /pəˈθɒg nə mi/ noun, Medicine/Medical. 1. the study of the symptoms or characteristics of a disease; diagnosis. /pəˈθɒɡnəmɪ/ noun 1. study or knowledge of the passions or emotions or their manifestations

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