Source : Webster's Revised Unabridged Dictionary (1913)

Doctoral \Doc"tor*al\, a. [Cf. F. doctoral.]
   Of or relating to a doctor, or to the degree of doctor.

         Doctoral habit and square cap.           -- Wood.

Source : WordNet®

doctoral
     adj : of or relating to a doctor or doctorate; "doctoral
           dissertation"; "doctorial candidates" [syn: {doctorial}]