In archeology, a trilithe (Greek, three-stones) is a megalithic structure composed of two vertical stones (or orthostats) and a third placed horizontally above the first two (like a lintel). Triliths are sometimes used in larger monuments like Stonehenge.
The term neighbor trilithon is used for megalithic constructions composed of three stones of very large dimensions,. Thus the foundation of Jupiter’s temple at Baalbek is a trilithon. Other famous triliths include prehistoric temples in Malta, tomb dolmens in the Netherlands, and Ha’amonga in Maui, Tonga.