a disordered or incorrectly functioning organ, part, structure, or system of the body resulting from the effect of genetic or developmental errors, infection, poisons, nutritional deficiency or imbalance, toxicity, or unfavorable environmental factors; illness; sickness; ailment.

any abnormal condition in a plant that interferes with its vital physiological processes, caused by pathogenic microorganisms, parasites, unfavorable environmental, genetic, or nutritional factors, etc.

any harmful, depraved, or morbid condition, as of the mind or society

His fascination with executions is a disease.

decomposition of a material under special circumstances

tin disease.

to affect with disease; make ill.

noun

health , vigor.

noun

ache , affection , attack , blight , breakdown , bug * , cancer , canker , collapse , complaint , condition , contagion , contamination , convulsions , debility , decrepitude , defect , disorder , distemper , endemic , epidemic , feebleness , fever , fit , flu , hemorrhage , ill health , illness , indisposition , infection , infirmity , inflammation , malady , misery , pathosis , plague , seizure , sickliness , sickness , spell , stroke , syndrome , temperature , unhealthiness , unsoundness , upset , virus , visitationnotes:decease is the event of dying or departure from life; disease is an impairment of health or a condition of abnormal and harmful functioningillness means sickness or poor health , while a disease is an impairment of health or a condition of abnormal functioning , ailment , ill , affliction , ergot , malignancy , morbus , pandemic , pathogenicity , pathology , pest , pestilence , visitation