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diagnostic. adj. 1. (Medicine) of, relating to, or of value in diagnosis. 2. (Biology) of, relating to, or of value in diagnosis. n. 3. (Medicine) med any symptom that provides evidence for making a specific diagnosis. 4. (Medicine) a diagnosis. 5. (Biology) a diagnosis.
Definition of diagnostic. 1  1a : of, relating to, or used in diagnosis a diagnostic toolb : using the methods of or yielding a diagnosis diagnostic tests. 2  2 : serving to distinguish or identify a diagnostic feature.