Diagnostics n. That part of medicine which has to do with ascertaining the nature of diseases by means of their symptoms or signs. "His rare skill in diagnostics."
... and unnecessary methods employed by those untrained for diagnostics, cannot be too vigorously condemned. For instance, the application of an active and depilating vesicant upon a large area on the gluteal or crural region, in a case where the practitioner "guesses" the condition to be one of "hip lameness," constitutes an exposition ... — Lameness of the Horse - Veterinary Practitioners' Series, No. 1 • John Victor Lacroix
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