D defs.my
Entry 1 sense Webster, 1913

Diagnostics

/dīˌ-əg-näs'-tĭks/ · Di·ag·nos·tics · IPA /dˌaɪəɡnˈɑstɪks/
01 n. That part of medicine which has to do with ascertaining the nature of diseases by means of their symptoms or signs.
  1. 1.
    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.” Macaulay.