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coping saw - A saw with a very narrow blade stretched across a u-shaped frame—for cutting curves, with cope meaning "vault, arch." More...
ossuary - From Latin os, "bone," it is any receptacle—urn, vault, etc.—for the bones of the dead. More...
camera - First meant "vault, chamber." More...
firmament - Means "vault of the sky," as a fixed structure. More...