TRILITHON

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.