Webster's English Dictionary

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fenestra

fe.nes.tra \fi-'nes-tr*\ \-.tre-, -.tri-\ \-tr*l\ n or fe.nes.trae [NL, fr. 
   L, window] pl  1: a small opening; esp : either of two apertures in the 
   bone betwe en the middle and inner ear 2: an opening cut in bone  3: a 
   transparent spot  - fe.nes.tral aj