Egynyílásos

Egynyílásos is a Hungarian architectural term describing an opening in a wall that consists of a single leaf or sash. It is used to classify windows, doors, arches, and other openings in plans and technical drawings, and it marks a contrast with openings that have two or more leaves (two-leaf, three-leaf, or multi-leaf configurations).

In practice, an egynyílásos ablak is a single-leaf window, typically with one frame and a movable sash, or a fixed pane in a non-opening sash, depending on design. An egynyílásos kapu or ajtó refers to a door or gate with one leaf. In architectural documentation, the designation helps describe the structural and aesthetic aspects of the opening, including its width, height, and relationship to the surrounding wall.

The term is most commonly encountered in Hungarian architectural literature, heritage surveys, technical catalogs, and renovation plans for buildings of various periods. While the concept is simple, actual instances can vary: some egynyílásos openings may accommodate divisions within the frame (muntins or glazing bars) that create the appearance of multiple panes, but the essential characteristic is that the opening comprises a single operative leaf.