(ˈ)trī|liˌthän, ˈtrīləˌth- noun
also tri·lith ˈtrīˌlith
( -s )
Etymology: New Latin trilithon, from Greek, neuter of trilithos of three stones, from tri- three + lithos stone — more at tri-
: an ancient stone monument consisting of two upright megaliths carrying a third as a lintel