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fenestella 
  n pl , -lae 
1  (R.C. Church) a small aperture in the front of an altar, containing relics 
2  (Ecclesiast) a niche in the side wall of a chancel, in which the credence or piscina are set 
3  (Architect) a small window or an opening in a wall 
  (C18: from Latin: a little window, from fenestra window) 

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