noun (used with a singular verb) Medicine/Medical.

  1. the discipline or practice of diagnosis.


  1. of, relating to, or used in diagnosis.
  2. serving to identify or characterize; being a precise indication.


  1. diagnosis(def 1).
  2. a symptom or characteristic of value in diagnosis.
  3. Medicine/Medical. a device or substance used for the analysis or detection of diseases or other medical conditions.
  4. Computers.
    1. a message output by a computer diagnosing an error in a computer program, computer system, or component device.
    2. a program or subroutine that produces such messages.


  1. (functioning as singular) the art or practice of diagnosis, esp of diseases


  1. of, relating to, or of value in diagnosis


  1. med any symptom that provides evidence for making a specific diagnosis
  2. a diagnosis

1620s (adjective and noun), from Greek diagnostikos “able to distinguish,” from diagnostos, verbal adjective from diagignoskein (see diagnosis). Related: Diagnostics.


  1. Of, relating to, or used in a diagnosis.
  2. Serving to identify a particular disease; characteristic.


  1. diagnostics The art or practice of medical diagnosis.
  2. A symptom or a distinguishing feature serving as supporting evidence in a diagnosis.
  3. An instrument or a technique used in medical diagnosis.

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