World English Dictionary
trefoil (ˈtrɛfɔɪl)
1.  any of numerous leguminous plants of the temperate genus Trifolium, having leaves divided into three leaflets and dense heads of small white, yellow, red, or purple flowers
2.  any of various related plants having leaves divided into three leaflets, such as bird's-foot trefoil
3.  a leaf having three leaflets
4.  architect an ornament in the form of three arcs arranged in a circle
[C14: from Anglo-French trifoil, from Latin trifolium three-leaved herb, from tri- + folium leaf]

Collins English Dictionary - Complete & Unabridged 10th Edition
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