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Wiktionary (0.00 / 0 votes) Rate this definition: disease (Noun). An abnormal condition of the body or mind that causes discomfort or dysfunction; distinct from injury insofar as the latter is usually instantaneously acquired. The tomato plants had some kind of disease that left their leaves splotchy and fruit withered. disease (Noun). Any abnormal or harmful condition, as of society, people's attitudes, way of living etc. disease (Verb). To cause unease; to annoy, irritate. disease (Verb). To infect with a disease.
A disease is a particular abnormal condition, a disorder of a structure or function, that affects part or all of an organism. The causal study of disease is called pathology. Disease is often construed as a medical condition associated with specific symptoms and signs.he term may be used to refer to the existence of any form of disease, or to the degree that the health condition affects the patient. Among severely ill patients, the level of morbidity is often measured by ICU scoring systems.