Definition of disease

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dis·ease

-z

) KEY

NOUN:

A pathological condition of a part, organ, or system of an organism resulting from various causes, such as infection, genetic defect, or environmental stress, and characterized by an identifiable group of signs or symptoms.
A condition or tendency, as of society, regarded as abnormal and harmful.
Obsolete Lack of ease; trouble.

ETYMOLOGY:
Middle English disese, from Old French : des-, dis- + aise, ease ; see ease

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