fenestra

fe·nes·tra

noun \fə-ˈnes-trə\

plural fe·nes·trae \-ˌtrē, -ˌtrī\

Definition of FENESTRA

1

: a small anatomical opening (as in a bone): as a : oval window b : round window

2

a : an opening like a window cut in bone (as in the inner ear in the fenestration operation) b : a window cut in a surgical instrument (as an endoscope)

—fe·nes·tral \-trəl\ adjective