American Heritage Dictionary
(2)
Century Dictionary
(5)
GNU Webster's 1913
WordNet
Elsewhere on the web
Marines and the four-pointed quatrefoil design, on the top of Marine officers caps, reportedly originated as a way for Marine snipers in the rigging overhead to identify their own officers and avoid shooting them. mobile.— WTOP / Business / Biz Stories
The result is that intervals of various shapes are left at each of the four angles of every quatrefoil, and into each interval is fitted a different animal, which gives the astonishing result of 596 minor carvings in this one doorway, all of them representing living things, and all of them subsidiary to the larger subjects which they frame.— The Story of Rouen
The centre design is a quatrefoil, inside which is a lamb with nimbus, and the letters AGNV DI.— Bell's Cathedrals: The Cathedral Church of Durham A Description of Its Fabric and A Brief History of the Espiscopal See
A large blank quatrefoil is inserted in the space between the lights and the outer arch moulding Illustration: NORTH AISLE OF THE CHOIR.— Bell's Cathedrals: The Cathedral Church of Carlisle A Description of Its Fabric and A Brief History of the Episcopal See
Large doorways of the Early English style were sometimes double, being divided into two arched openings by a shaft, either single or clustered; and above this a quatrefoil was generally inserted, but sometimes the head was filled with sculptured detail.— The Principles of Gothic Ecclesiastical Architecture, Elucidated by Question and Answer, 4th ed.

American Heritage Dictionary (1)
Century Dictionary (1)
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