I always wondered where, in the literature, the Druids worshiped in a ‘nemeton’, which was the idea of a sacred ring of trees, because ‘nemeton’ didn’t sound Gaelic, or Celtic, if you will. According to many sources, it is Celtic. So, when I ran across this on Electric Scotland, it felt right, and I wanted to make note of it:
The idea of the sacred grove of trees is an old one and in Scotland we have many sites that might be associated with such places. The Romans wrote of nemetons or sacred groves in these islands and elsewhere, and the name is very like a Gaelic term Neimheadh (nevay) which meant “a sacred enclosure”.
Source: http://www.electricscotland.com/history/articles/wells_trees.htm