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Gable - A triangular area of an exterior wall formed by two sloping roofs.

Gambrel - A roof where each side has two slopes; a steeper lower slope and a flatter upper one; a 'barn roof'. Often found in Colonial revival houses in the "Dutch" style.

Gazebo - A small summerhouse or pavilion with a view, or a belvedere on the roof of a house.

Girder - A strong, wooden member spanning foundation walls designed to support joist ends.