hagioscope

thumb|Squint in wall of north aisle chapel, St Nicholas's Church, Walcot, Lincolnshire|Walcot, Lincolnshire, looking towards south-east, with a view of the high altar in the chancel beyond. To its right is a [[piscina supported by a carving of a man's head on the jamb of the wall.]] thumb|The squint at the Church of the Blessed Virgin Mary, Compton Pauncefoot, Somerset

A hagioscope () or squint is an architectural term denoting a small splayed opening or tunnel at seated eye-level, through an internal masonry dividing wall of a church in an oblique direction (south-east or north-east), giving worshippers a view of the altar and therefore of the elevation of the host. Where worshippers were separated from the high altar not by a solid wall of masonry but by a transparent parclose screen, a hagioscope was not required as a good view of the high altar was available to all within the sectioned-off area concerned. Where a squint was made in an external wall so that lepers and other non-desirables could see the service without coming into contact with the rest of the populace, they are termed leper windows or lychnoscopes.