Definition

Noun: 1. A flat arch: A straight arch is a specific architectural structure. It is an arch where the voussoirs (the wedge-shaped stones or bricks) support each other to form a span with a straight horizontal line on both its outer (extrados) and inner (intrados) curves. Unlike a typical curved arch, it appears flat or nearly flat across the top.

Usage

• The straight arch is a notable feature in some classical and modern architecture, providing a flat, linear appearance for doorways or windows while still functioning as an arch to distribute weight.
• It is also commonly called a flat arch or a jack arch.

Examples

• The builder used a straight arch over the window to maintain the clean, horizontal lines of the building's facade.
• Despite its flat appearance, the straight arch effectively supports the weight of the wall above it.

Advanced Usage

• In engineering, a straight arch relies on precise construction and the compressive strength of its materials, as the voussoirs must be carefully shaped to transfer loads horizontally to the abutments.

Variants and Related Words

• Flat arch (noun): A direct synonym for a straight arch.
• Jack arch (noun): Another common term for this type of arch, often used in construction.
• Voussoir (noun): A wedge-shaped stone or brick used in building an arch.
• Extrados (noun): The outer curve of an arch.
• Intrados (noun): The inner curve or underside of an arch.

Synonyms

• Flat arch
• Jack arch

Related Terms (Not Phrasal Verbs or Idioms)

• Arch: A curved symmetrical structure spanning an opening and supporting weight.
• Lintel: A horizontal support across the top of a door or window, which serves a similar visual purpose but is a different structural element.

Noun

1. an arch with mutually supporting voussoirs that has a straight horizontal extrados and intrados