Etymology
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diagnose (v.)

"to ascertain or determine (a disease) from its symptoms," 1861, back-formation from diagnosis (q.v.) on the model of metamorphose, etc. Earlier was diagnosticate (by 1834). Related: Diagnosed; diagnosing.

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Definitions of diagnose

diagnose (v.)
determine or distinguish the nature of a problem or an illness through a diagnostic analysis;
Synonyms: name
diagnose (v.)
subject to a medical analysis;
From wordnet.princeton.edu