Tril″i‐thon (trĭl″ĭ‐thŏn), n.; pl.Trilithons (#). [NL., fr. Gr.� of or with three stones; � (see Tri-) + � stone.] (Archæol.) A monument consisting of three stones; especially, such a monument forming a kind of doorway, as among the ancient Celts.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.