fenestra
fe·nes·tra
noun \fə-ˈnes-trə\plural ; fe·nes·trae \-ˌtrē, -ˌtrī\ (audio pronunciation) (audio pronunciation)
Definition of FENESTRA
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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\ (audio pronunciation) adjective
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