A stone arch made from two upright slabs with one lying atop these. They are featured in Stonehenge.
A trilithon is a megalithic structure comprising a horizontal lintel supported by two uprights. Stonehenge includes several examples.Found on http://www.probertencyclopaedia.com/browse/TT.HTM
• (n.) A monument consisting of three stones; especially, such a monument forming a kind of doorway, as among the ancient Celts.Found on http://thinkexist.com/dictionary/meaning/trilithon/
trilith, trilithon A massive prehistoric stone structure, resembling a doorway, consisting of two vertical stones with a third supported horizontally by the other two.Found on http://www.wordinfo.info/words/index/info/view_unit/2740/7
A trilithon (or trilith) is a structure consisting of two large vertical stones (posts) supporting a third stone set horizontally across the top (lintel). It is commonly used in the context of megalithic monuments. The most famous trilithons are those of Stonehenge in England and those found in the Megalithic temples of Malta, both of which are UN...Found on http://en.wikipedia.org/wiki/Trilithon
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