毛面浮雕

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.