Webster's English Dictionary

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diagnostic

1. di.ag.nos.tic \-'na:s-tik\ \-ti-k(*-)le-\ aj : of or relating to 
   diagnosis  - di.ag.nos.ti.cal.ly av
2. diagnostic \-.na:s-'tish-*n\ n 1: the art or practice of diagnosis - 
   often used in pl.  2: a distinguishing mark  - di.ag.nos.ti.cian n