society > faith > artefacts > division of building (general) > other parts > [noun] > hagioscope (5)
Architecture. = hagioscope, n.
A small opening or window in a chancel arch or wall, enabling worshippers (esp. those in an aisle or side chapel) to see the elevation of the host…
A name given to the low-side window, n. on the supposition that its purpose was to allow lepers to see the altar lights.
a small window or opening in a church wall, supposedly intended to allow lepers outside to see the elevation of the host.