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trilateral
trilateralism
trilateration
trilby
trilemma
trilinear
trilingual
triliteral
trilithon
trill (1)
trill (2)
trillion
trillionth
trillium
trilobate
trilobite
trilocular
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trilithon

tri·lith·on [ trī lí thòn, trli thòn ] (plural tri·lith·ons) or tri·lith [ tr lìth ] (plural tri·liths)


noun 
Definition:
 
ancient stone structure: a prehistoric structure consisting of two large vertical stones supporting a horizontal stone laid on top of them

[Mid-18th century. < Greek< lithos "stone"]

tri·lith·ic [ trī líthik ] adjective
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