I thought as I came across notable words from Wordnik's Word of the Day service, I'd post them here. Short and sweet. Here you go.
The Wordnik Word of the Day for September 7, 2010 is
(noun) A stone coffin in the form of a pit covered with earth and surrounded by stones.
'Kistvaen' comes from the Welsh, 'cistfaen,' meaning 'chest' (cist) plus 'stone' (maen).
"Drizzlecombe, near Sheep's Tor, is rich in a variety of antiquities, for it has three stone rows, a large tumulus, a kistvaen, and a later relic -- a miner's blowing-house."
- Devon, Its Moorlands, Streams and Coasts, by Rosalind Northcote