贯石

Perpend stone \Per"pend stone`\
See {Perpender}.

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}.