The Collaborative International Dictionary of English v.0.48:

Pictorial \Pic*to"ri*al\, a. [L. pictorius, fr. pictor a
   painter, fr. pingere to paint. See Paint.]
   Of or pertaining to pictures; illustrated by pictures;
   forming pictures; representing with the clearness of a
   picture; as, a pictorial dictionary; a pictorial imagination.
   "Pictorial rhetoric." --Ruskin. -- Pic*to"ri*al*ly, adv.
   [1913 Webster] Pictoric

WordNet (r) 3.0 (2006):

pictorially
    adv 1: in a pictorial manner; "depth is established pictorially"