Illustrated Architecture Dictionary

Gable
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That part of the wall immediately under the end of a pitched roof, cut into a triangular shape by the sloping sides of the roof

Gable roof: A pitched roof having a gable at each end

Cross-gable: Two perpendicular gable roofs

Bell gable: A small turret placed on the ridge of a church roof to hold one or more bells

Dutch gable: A gable having a pediment whose outline contains two or more curves on each side of its apex.

Gable window: Window in a gable; Window shaped like a gable

Step gable / corbie gable / crow gable: stair-step type of design at the top of the triangular gable-end of a building.

Clipped gable/jerkinhead

Pediment: A triangular gable across a portico, door or window; any similar triangular decorative piece over a doorway, fireplace, etc.

Tympanum: The triangular recessed face of a pediment.

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Examples from Buffalo architecture:

• Illustration above: 232 Crescent Avenue
  
  
• St. Teresa RC Church
  
  
• 361 Porter Avenue
  
  
• Michigan Street Baptist Church
  
  
• Jewett M. Richmond House Cross-gable
  
  
• 144 Edward St.
  
  
• Wicks House
  
  
• 232 Crescent Avenue
  
  
• 31 Middlesex Rd.
  
  
• 167 Louvaine, Kenmore Flared gable roof
  
  
• 551 Richmond Ave.

Other Examples:

• American Athens: Greek Revival Architecture in Western New York State
  
  
• Amsterdam (Netherlands) Canal House Gables
  
  
• Oshevnev House, Kizhi, Russia