Illustrated Architecture Dictionary

Sexfoil
SEX foyl

A six-lobed circle or arch formed by cusping

Used in windows and arches

In French, "foil" means "leaf." The number of foils involved is indicated by a prefix, e.g. trefoil, quatrefoil, cinquefoil, sexfoil, multifoil

Found in Gothic Revival, Tudor Revival styles

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Examples from Buffalo architecture:

• Illustration above: First Free Baptist Church
  
  
• Annunciation RC Church Stained glass window

Other examples:

• Salisbury Cathedral, England
  
  
• Florence Cathedral, Italy