1 [countable] medicalMI
a mental or physical illness which prevents part of your body from working properly
a disorder of the brain/liver/digestive system etc
He suffers from a rare disorder of the liver.
a mental/psychiatric disorder
people with mental disorders
severe eating disorders such as bulimia and anorexia
a situation in which a lot of people behave in an uncontrolled, noisy, or violent way in public
A number of stadiums were closed because of crowd disorder.