— fenestral , adj.
/fi nes"treuh/ , n. , pl. fenestrae /-tree/ .
1. Anat. , Zool. a small opening or perforation, as in a bone, esp. between the middle and inner ear.
2. Entomol. a transparent spot in an otherwise opaque surface, as in the wings of certain butterflies and moths.
3. Archit. a windowlike opening.
[ 1820-30; fenestra window, hole (in a wall) ]