• Webster's Revised Unabridged Dictionary
    • n Quatrefoil Same as Quarterfoil.
    • ***
Century Dictionary and Cyclopedia
    • n quatrefoil A leaf with four leaflets, as sometimes that of clover.
    • n quatrefoil In architecture, an opening or a panel divided by cusps or foliations into four foils, or, more correctly, the figure formed by the cusps. This ornament resembles the four petals of a cruciform flower, but is certainly not derived from imitation of such a flower. Bands of small quatrefoils are much used as ornaments in the English Perpendicnlar style, and sometimes in the Decorated. The same name is given also to flowers and leaves of similar form carved in relief as ornaments on moldings, etc. See also cut under gallery.
    • n quatrefoil In heraldry, a four-leaved grass, or leaf divided into four leaflets, used as a bearing.
    • ***


Webster's Revised Unabridged Dictionary
F. quatre feuilles,


In literature:

They are said to have been fixed within the quatrefoils on five sides, the remaining three being plain.
"Wanderings in Wessex" by Edric Holmes
W. tower, in which the usual string course is replaced by a band of quatrefoils.
"Somerset" by G.W. Wade and J.H. Wade
Between the quatrefoils are winged heads of ten angelic figures.
"Bell's Cathedrals: Chichester (1901)" by Hubert C. Corlette
The Keep, which is in plan like a quatrefoil, consisted of two storeys.
"Life in a Mediæval City" by Edwin Benson
I laughed, and, looking down, I saw one little quatrefoil just at my feet.
"Dr. Dumany's Wife" by Mór Jókai
The division between clerestory and triforium is marked by a band of stone ornamented with quatrefoils.
"The Cathedral Church of York" by A. Clutton-Brock
In the tympanum is a quatrefoil, the upper part of which projects so as to form a canopy.
"Bell's Cathedrals: Wimborne Minster and Christchurch Priory" by Thomas Perkins
Was the panelled or sunk quatrefoil much used in decorative detail?
"The Principles of Gothic Ecclesiastical Architecture, Elucidated by Question and Answer, 4th ed." by Matthew Holbeche Bloxam
Below the string-course above are four deep quatrefoils.
"Bell's Cathedrals: The Cathedral Church of Ely" by W. D. Sweeting
"Our Fathers Have Told Us" by John Ruskin

In news:

Many blogs have grown out of stores, but Quatrefoil Design is a store that grew out of a blog.
Ramsey County, Quatrefoil Library, $6,432.
The keys are gold, silver, and platinum, with heads shaped like ovals, squares, trefoils, quatrefoils, and hearts.