Definitions for quatrefoilˈkæt ərˌfɔɪl, ˈkæ trə-
Random House Webster's College Dictionary
quat•re•foilˈkæt ərˌfɔɪl, ˈkæ trə-(n.)
a leaf composed of four leaflets.
an architectural ornament composed of four lobes, separated by cusps, radiating from a common center.
Origin of quatrefoil:
1375–1425; ME < MF quatre four +-foil (as in trefoil )
a symmetrical shape which forms the overall outline of four partially-overlapping circles of the same diameter.
A stylized flower or leaf with four lobes.
same as Quarterfoil