verb (used with object), di·ag·nosed, di·ag·nos·ing.
- to determine the identity of (a disease, illness, etc.) by a medical examination: The doctor diagnosed the illness as influenza.
- to ascertain the cause or nature of (a disorder, malfunction, problem, etc.) from the symptoms: The mechanic diagnosed the trouble that caused the engine knock.
- to classify or determine on the basis of scientific examination.
verb (used without object), di·ag·nosed, di·ag·nos·ing.
- to make a diagnosis.
- to determine or distinguish by diagnosis
- (tr) to examine (a person or thing), as for a disease
1861, back-formation from diagnosis. Related: Diagnosed; diagnosing.
- To distinguish or identify a disease by diagnosis.
- To identify a person as having a particular disease or condition by diagnosis.