- trefoil (n.)
[trefoil 词源字典]
- late 14c., type of clover, from Anglo-French trifoil (13c.), Old French trefueil "clover, clover-leaf," from Latin trifolium "three-leaved plant," from tri- "three" (see tri-) + folium "leaf" (see folio). As a type of ornamental figure in medieval architecture, early 15c.[trefoil etymology, trefoil origin, 英语词源]