Real Dictionary

cloverleaf
countable noun: A cloverleaf is an arrangement of curved roads, resembling a four-leaf clover, that joins two main roads.

cloverleaf in American English
an interchange which, by means of an overpass with curving ramps that form the outline of a four-leaf clover and other connecting roads, permits traffic to move or turn in any of four directions with little interference
in the shape or pattern of a leaf of clover
adjective: shaped like or resembling a leaf or leaves of clover
noun: 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

cloverleaf in British English
noun: an arrangement of connecting roads, resembling a four-leaf clover in form, that joins two intersecting main roads