The Collaborative International Dictionary of English v.0.48:

Xylopyrography \Xy`lo*py*rog"ra*phy\ n. [Xylo- + Gr. ?, ?, fire
   + -graphy.]
   The art or practice of burning pictures on wood with a hot
   iron; -- called also wood burning and poker painting. See
   Poker picture, under Poker.
   [1913 Webster + PJC]
   [1913 Webster]