1. 
   Trilithon
   A trilithon is a megalithic structure comprising a horizontal lintel supported by two uprights. Stonehenge includes several examples.
   Found op http://www.probertencyclopaedia.com/browse/TT.HTM
   
   
2. 
   Trilithon
   A stone arch made from two upright slabs with one lying atop these. They are featured in Stonehenge.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
3. 
   Trilithon
   • (n.) A monument consisting of three stones; especially, such a monument forming a kind of doorway, as among the ancient Celts.
   Found op http://thinkexist.com/dictionary/meaning/trilithon/
   
   
4. 
   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 op http://www.wordinfo.info/words/index/info/view_unit/2740/7
   
   
5. 
   Trilithon
   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...
   Found op http://en.wikipedia.org/wiki/Trilithon
   
   

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