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fenestra  n pl , -trae 
1  (Biology) a small opening, esp. either of two openings between the middle and inner ears 
2  (Zoology) a transparent marking or spot, as on the wings of moths 
3  (Architect) a window or window-like opening in the outside wall of a building 
 (C19: via New Latin from Latin: wall opening, window) 
 fenestral  adj