trefoil

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trefoil /ˈtriːˌfojəl/ noun
plural trefoils
trefoil
/ˈtriːˌfojəl/
noun
plural trefoils
Learner's definition of TREFOIL
[count]
: a plant (such as a clover) that has three leaves on each stem
: a decorative object or design that is shaped like a leaf with three parts