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n, pl -lae (-liː)
1. (Ecclesiastical Terms) RC Church a small aperture in the front of an altar, containing relics
2. (Ecclesiastical Terms) ecclesiast a niche in the side wall of a chancel, in which the credence or piscina are set
3. (Architecture) architect a small window or an opening in a wall
[C18: from Latin: a little window, from fenestra window]