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The ribs spread at the start to enclose a trefoiled panel, and they curve into one another when they meet at the bosses.
From Bell's Cathedrals: The Cathedral Church of Wells A Description of Its Fabric and a Brief History of the Episcopal See by Percy Dearmer
Within comes the doorway itself; a large trefoiled arch of many mouldings of which the outermost, richly crocketed, turns up as an ogee, to pierce the horizontal line above with its finial.
From Portuguese Architecture by Walter Crum Watson
The angles have shafts, and there is a pointed trefoiled cornice with carved mouldings and cornice above.
From The Shores of the Adriatic The Austrian Side, The Küstenlande, Istria, and Dalmatia by F. Hamilton (Frederick Hamilton) Jackson
The latter was dark, a single trefoiled window admitting on either side of its column and through its greenish bottle-glass but little light from the narrow street.
From Renaissance Fancies and Studies Being a Sequel to Euphorion by Vernon Lee
The illustration shows the three stages of trefoiled arches, the two lower with coupled colonnettes.
From The Shores of the Adriatic The Austrian Side, The Küstenlande, Istria, and Dalmatia by F. Hamilton (Frederick Hamilton) Jackson
