The term hagioscope is a type of architectural feature found in churches. It is a small opening or window in the wall of a church, usually located near the altar, that allows people outside the church to view the interior. The term hagioscope is derived from the Greek words 'hagios' meaning holy and 'skopein' meaning to look. The crossword solution for this term is 'SQUINT', which means to look with narrowed eyes.