What does sepulcher mean?

I assume you are asking for the definition of a sepulcher.
A sepulcher is a place of entombment--a place where a dead body is buried or placed as
in a grave, or set apart as for burial. It is most often a type of burial vault or
mausoleum, but it can also refer to a standard earthen grave. The word sepulcher can be
used as a noun (as above) or as a verb. The verb form more specifically means "to be
buried or interred." Sepulcher is an old fashioned word, often found in the writings of
William Shakespeare and Edgar Allan Poe.