1. Plural of eyehole; openings or holes through which the eyes can see, especially in a mask, helmet, or similar object.
Usage: Most commonly used in the context of masks, helmets, or protective gear
2. Openings in a wall or structure designed to allow vision or light to pass through.
Usage: Architectural or structural term

Examples

• The knight's helmet had two small eyeholes for vision.
• She peered through the eyeholes of her Halloween mask.
• The medieval fortress had narrow eyeholes in its defensive walls.
• The diver's mask had large eyeholes for better underwater visibility.
• The costume's eyeholes were positioned perfectly for the actor to see the audience.