from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A stone placed over a grave as a marker; a tombstone.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A stone slab set at the head of a grave.
from the GNU version of the Collaborative International Dictionary of English
- n. A stone laid over, or erected near, a grave, usually with an inscription, to preserve the memory of the dead; a tombstone.
from The Century Dictionary and Cyclopedia
- n. A stone laid over a grave, or erected near it (commonly at its head), in memory of the dead.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a stone that is used to mark a grave
Sorry, no etymologies found.
In the north especially the grave is very often surmounted by a huge marble tortoise bearing the inscribed tablet, or what we call the gravestone, on its back.
 The gravestone is briefly described in Letter 413.
While digitization of a gravestone is certainly “lossy,” in that the stones are three dimensional, have color, and are different in differing conditions of light, their depiction here is clearly a form of preservation, at least of information, as originals are lost.
As if, you know, “who you are” is carved in gravestone and is absolutely immutable.
His gravestone is located in front of a quintet of ghostly musicians who eternally perform in the attraction's memorable graveyard scene.
Traditionally, the gravestone is erected about a week after burial.
On his gravestone are the Latin words, "Aude sapere," which translates as "dare to taste, to experience."
On his gravestone is the epitaph composed by himself: "Here lies one whose name was writ in water."
You argue, and reason, but I know this, my friend, that something was left out of this man when he was made, and it is that thing that we must find, or he will die among us a ruined soul, and his gravestone will be the monument of our shame.
View the inscription on that gravestone, which is now almost overgrown with thorns.