资料来源 : Webster's Revised Unabridged Dictionary (1913)

Perpender \Per*pend"er\, n. [F. parpaing, pierre parpaigne; of
   uncertain origin.] (Masonry)
   A large stone reaching through a wall so as to appear on both
   sides of it, and acting as a binder; -- called also
   {perbend}, {perpend stone}, and {perpent stone}.