Source : Webster's Revised Unabridged Dictionary (1913)

Bossage \Boss"age\, n. [F. bossage, fr. bosse. See {Boss} a
   stud.]
   1. (Arch.) A stone in a building, left rough and projecting,
      to be afterward carved into shape. --Gwilt.

   2. (Arch.) Rustic work, consisting of stones which seem to
      advance beyond the level of the building, by reason of
      indentures or channels left in the joinings. --Gwilt.