What is the definition of a sepulcher?

A sepulcher refers specifically to a burial vault or tomb where the remains of the deceased are laid to rest. This term carries historical and cultural significance, often associated with ancient burial practices and can be found in various religious and cultural contexts. The essence of a sepulcher is its role as a final resting place, often designed to honor the deceased and provide a space for remembrance.

The other options present definitions that do not align with the concept of a sepulcher. A thick varnish for finishing wood has no relation to burial or tombs. An act of moving aside does not pertain to burial practices, and inducing sleep is unrelated to the final resting places of the deceased. Thus, the definition of a sepulcher as a burial vault is the most accurate and relevant choice among the given options.