Definition

Noun: A pointed arch characterized by having three distinct, rounded lobes or cusps (foils) along its inner curve (intrados), with one cusp at the apex and one on either side of it. It is a decorative architectural feature common in Gothic architecture.

Usage

The term is used specifically in architectural history and description to identify a particular ornamental style of arch. - The trefoil arch above the doorway is a fine example of early Gothic detailing. - The architect incorporated a trefoil arch into the design of the church window.

Examples

• The delicate stonework of the trefoil arch framed the stained-glass window beautifully.
• Restoration work focused on repairing the intricate carvings within the trefoil arch.

Advanced Usage

• As a defining stylistic element: The consistent use of the trefoil arch is a hallmark of the Decorated Gothic period in English architecture.
• In architectural analysis: Scholars note that the trefoil arch often symbolizes the Holy Trinity in Christian church architecture.

Variants and Related Words

• Trefoil (noun): A graphic shape or ornament consisting of three lobes, like a three-leaf clover. This is the fundamental form from which the arch derives its name.
• Cinquefoil arch (noun): A similar pointed arch with five lobes or cusps.
• Multifoil arch (noun): A general term for an arch with more than three cusps or foils.

Synonyms

• Three-foiled arch
• Triple-cusped arch

Related Terms (Architectural Context)

• Cusp (noun): The point where two curves meet, forming the lobe of a trefoil or similar arch.
• Intrados (noun): The inner curve or underside of an arch.
• Pointed arch (noun): The broader category of arches with a pointed crown, under which the trefoil arch is a specific subtype.

Noun

1. a pointed arch having cusps in the intrados on either side of the apex