Source : Webster's Revised Unabridged Dictionary (1913)

Belletristic \Bel`le*tris"tic\, Belletristical
\Bel`le*tris"tic*al\, a.
   Occupied with, or pertaining to, belles-lettres. ``An
   unlearned, belletristic trifler.'' --M. Arnold.