quatrefoil /katˈər-foil or katˈrə-foil/ or quatrefeuille /-fœ-ē or -fīl/

1. A four-petalled flower or leaf of four leaflets
2. An openwork design or ornament divided by cusps into four lobes (architecture)

• boombox
• boomboxes
• boomed
• boomer
• boomerang
• boomeranged
• boomeranging
• boomerangs
• boomers
• boomier
• boomiest
• booming
• boomings
• boom-iron
• boom-irons
• boomlet
• boomlets
• boomps-a-daisy
• booms
• boomslang
• boomslangs
• boom town
• boom towns
• boomy
• boon