noun, plural cloverleafs, cloverleaves.
a road arrangement, resembling a four-leaf clover in form, for permitting easy traffic movement between two intersecting high-speed highways. One highway passes over the other, and both are joined by a system of curved feeder roads permitting vehicles to enter and leave the highways.
shaped like or resembling a leaf or leaves of clover.

1930–35; clover + leaf

cloverleafed, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cloverleaf (ˈkləʊvəˌliːf)
n , pl -leaves
1.  an arrangement of connecting roads, resembling a four-leaf clover in form, that joins two intersecting main roads
2.  (modifier) in the shape or pattern of a leaf of clover

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