tricuspidal

Wandering round to the façade, finished in 1886, it is a careful imitation of fifteenth-century work we see, saved from the mere routine of just that, in its design at any rate, by the vote of the people, who, against the opinion of all the artists in Florence at that time, insisted on the cornice following the basilical form of the tower, refusing to endorse the pointed "tricuspidal" design.

Florence and Northern Tuscany with Genoa With Sixteen Illustrations In Colour By William Parkinson And Sixteen Other Illustrations, Second Edition Edward Hutton 1922

The facade is decorated with bands of red, white, and black marble, tricuspidal, and richly adorned with sculptures

The Catholic Encyclopedia, Volume 13: Revelation-Stock 1840-1916 1913