Meaning of “disease” - Learner’s Dictionary

disease

noun [ C, U ] us uk /dɪˈziːz/
Extra Examples
an incurable diseaseEating fatty food increases the risk of heart disease.The disease affects both humans and animals.As many as 6000 people may have been infected with the disease.The disease mainly occurs in women over 40.

B1 an illness caused by an infection or by a failure of health and not by an accident:

heart disease
an infectious disease
diseased adjective

affected by a disease:

a diseased lung

(Definition of “disease” from the Cambridge Learner’s Dictionary © Cambridge University Press)