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.

to make a diagnosis.

verb

misdiagnose

verb

analyze , determinate , determine , diagnosticate , distinguish , interpret , investigate , pinpoint , place , pronounce , recognize , spot , identify , trace