WordReference Random House Unabridged Dictionary of American English © 2015
tri•lith•on  (trī lithon, trīlə thon), 
  1. a prehistoric structure consisting of two upright stones supporting a horizontal stone.
Also, tri•lith (trīlith) 
  • Greek trílithon, neuter of trílithos having three stones. See tri-, -lith
  • 1730–40

Collins Concise English Dictionary © HarperCollins Publishers::

trilithon /traɪˈlɪθɒn; ˈtraɪlɪˌθɒn/, trilith /ˈtraɪlɪθ/ n
  1. a structure consisting of two upright stones with a third placed across the top, such as those of Stonehenge
Etymology: 18th Century: from Greek; see tri-, -lith

trilithic /traɪˈlɪθɪk/ adj

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