Source : Webster's Revised Unabridged Dictionary (1913)

Orthoepic \Or`tho*["e]p"ic\, Orthoepical \Or`tho*["e]p"ic*al\,
   a.
   Of or pertaining to ortho["e]py, or correct pronunciation. --
   {Or`tho*["e]p"ic*al*ly}, adv.