Source : Webster's Revised Unabridged Dictionary (1913)

Cathodic \Ca*thod"ic\ (k[.a]*th[o^]d"[i^]k), a. (Physiol.)
   A term applied to the centrifugal, or efferent, course of the
   nervous influence. --Marshall Hall.

Source : WordNet®

cathodic
     adj : of or at or pertaining to a cathode; "cathodic deposition of
           metals" [ant: {anodic}]