HEADSTONE
gravestone, headstone, tombstone
(noun) a stone that is used to mark a grave
keystone, key, headstone
(noun) the central building block at the top of an arch or vault
Source: WordNet® 3.1
Etymology
Noun
headstone (plural headstones)
A gravestone, a grave marker: a monument traditionally made of stone placed at the head of a grave.
The cornerstone or principal stone of a building.
Anagrams
• head notes, head-notes, headnotes, noteheads, stonehead
Source: Wiktionary
Head"stone`, n.
1. The principal stone in a foundation; the chief or corner stone.
Ps. cxviii. 22.
2. The stone at the head of a grave.
Source: Webster’s Unabridged Dictionary 1913 Edition