Trefoil

имя существительное 1) клевер Синоним(ы): clover 2) [архитектура] орнамент в виде трилистника 3) а) совокупность трёх предметов б) трое людей

Большой англо-русский словарь

Trefoil

noun Etymology: Middle English, from Anglo-French, from Latin trifolium, from tri- + folium leaf — more at blade 1. a. clover 1; broadly any of several leguminous herbs (as bird's-foot trefoil) with leaves that have or appear to have three leaflets b. a trifoliolate leaf 2. an ornament or symbol in the form of a stylized trifoliolate leaf

Merriam-Webster's Collegiate Dictionary