Etymology of the Latin word cenotaphium
the Latin word cenotaphium (cenotaph, empty tomb, monument to one whose body is elsewhere)
derived from the Greek word kenotaphion, κενοτάφιον
derived from the Greek word kenos, κενός, κενῶς (empty ; vainly; to no purpose)
derived from the Greek word taphos, τάφος (a grave (the place of interment))