1. of, relating to, or resembling a window or windows
Usage: formal; technical
2. of or relating to an opening or aperture in a structure
Usage: architecture; technical

Examples

• The fenestral design of the cathedral allowed light to flood the interior.
• The building's fenestral arrangement created a striking pattern on the facade.
• Architects studied the fenestral proportions of classical buildings.
• The fenestral openings were carefully positioned for optimal ventilation.