A disease is an abnormal condition affecting the body of an organism. It is often construed to be a medical condition associated with specific symptoms and signs. en.wikipedia.org
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disease /disease/ (d-zz) any deviation from or interruption of the normal structure or function of any body part, organ, or system that is manifested by a ... medical-dictionary.thefreedictionary.com
noun 1. a disordered or incorrectly functioning organ, part, structure, or system of the body resulting from the effect of genetic or developmental errors, infection ... dictionary.reference.com