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

'trilithon' also found in these entries:
In the English description:

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