Keystone

Definition:

• (n.) The central or topmost stone of an arch. This in some styles is made different in size from the other voussoirs, or projects, or is decorated with carving. See Illust. of Arch.

Compare keystone with other words:

base vs. keystone

cornerstone vs. keystone

kerbstone vs. keystone

keystone vs. linchpin

capstone vs. keystone

keystone vs. quoin

keystone vs. pennsylvania

arch vs. keystone

keystone vs. top

keystone vs. sagitta

keystone vs. mask

key vs. keystone

keystone vs. stone