Source : Webster's Revised Unabridged Dictionary (1913)

Clinical \Clin"ic*al\, Clinic \Clin"ic\, a. [Gr. ?, fr. ? bed,
   fr. ? to lean, recline: cf. F. clinique. See {Lean}, v. i.]
   1. Of or pertaining to a bed, especially, a sick bed.

   2. Of or pertaining to a clinic, or to the study of disease
      in the living subject.

Source : WordNet®

clinical
     adj 1: relating to a clinic or conducted in or as if in a clinic
            and depending on direct observation of patients;
            "clinical observation"; "clinical case study"
     2: scientifically detached; unemotional; "he spoke in the
        clipped clinical monotones typical of police testimony"