Definition of "pyramidal"

At one point was an isolated pyramidal rock, crowned by a great tree, which appeared to be separated by a cleft from the main crag.

1912, Arthur Conan Doyle, The Lost World […], London, New York, N.Y.: Hodder and Stoughton

Below is the deep abyss of the Lauterbrunnen valley, and at its head a stately semi-circle of mountains, with the pyramidal Lauterbrunnen Breithorn as the centre-piece.

1960 December, Voyageur, “The Mountain Railways of the Bernese Oberland”, in Trains Illustrated, page 752

Among its attractive features were decorative, tile-hung Italianate towers with pyramidal roofs.

2023 March 22, Dr Joseph Brennan, “Grand buildings on the list... and lost: Greenock Princes Pier”, in RAIL, number 979, page 52