It was a Druidical trilithon, consisting of three oblong stones in the form of a doorway, two on end, and one across as a lintel.
"A Changed Man and Other Tales" by Thomas Hardy
There is more than one explanation of the probable method of the construction of the trilithons.
"Wanderings in Wessex" by Edric Holmes
There are two pillars, and a great lintel coping them, like the trilithons of Stonehenge.
"Expositions of Holy Scripture: Romans Corinthians (To II Corinthians, Chap. V)" by Alexander Maclaren
These stones are not so high as the trilithons, the tallest reaching only 7-1/2 feet.
"Rough Stone Monuments and Their Builders" by T. Eric Peet
The second illustration gives a nearer view of the great trilithon gate in the upper court, at the head of the ramp.
"History Of Egypt, Chaldæa, Syria, Babylonia, And Assyria In The Light Of Recent Discovery" by L.W. King and H.R. Hall
It is merely a heap of stones, and the trilithons on Salisbury Plain are not more desolate.
"Leaves from a Field Note-Book" by J. H. Morgan
The monument proper, consisting of a circle of Sarsen Trilithons, enclosing a circle of upright foreign stones.
"Stonehenge" by Frank Stevens
Another possible explanation of the trilithon is, as Sir Basil Thomson points out, that it served as a gateway to some sacred spot inland.
"The Belief in Immortality and the Worship of the Dead" by James George Frazer