Definition of diagnose verb from the Oxford Advanced American Dictionary

 

diagnose

 verb
verb
NAmE//ˈdaɪəɡˌnoʊs//
 
, NAmE//ˌdaɪəɡˈnoʊs//
 
[transitive, intransitive]Verb Forms present simple I / you / we / they diagnose
 
he / she / it diagnoses
 
past simple diagnosed
 
-ing form diagnosing
 
 
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to say exactly what an illness or the cause of a problem is diagnose (something) The test is used to diagnose a variety of diseases. diagnose something as something The illness was diagnosed as cancer. diagnose somebody with something He has recently been diagnosed with angina. diagnose somebody as something He was diagnosed as a diabetic when he was 64.
See the Oxford Advanced Learner's Dictionary entry: diagnose