Illustrated Architecture Dictionary

Chateau / Chateauesque
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(plural châteaux)

The Chateau style, c. 1860-1910, is characterized by massive and irregular forms, steeply pitched hip or gable roofs with dormers, towers, and tall elaborately decorated chimneys with corbeled caps

A "chateau" is a French castle, country manor, or large country home.

For more information, see Wikipedia: Château

Examples:

• Illustration above: Versailles