diagnostic
- A tool, method, or procedure used to determine the nature or cause of a condition, situation, or problem. nounThe mechanic used a diagnostic to identify the issue with the car's engine.Doctors rely on various diagnostics to accurately diagnose illnesses.
- Relating to or used for the purpose of diagnosis. adjectiveThe diagnostic test revealed the presence of the virus in the patient's blood.She underwent several diagnostic procedures to determine the cause of her symptoms.