Fenestra

·noun A small opening; ·esp., one of the apertures, closed by membranes, between the tympanum and internal ear.

fenestra
fĕnestra, ae (also contr. festra, Enn. ap. Macr. S. 3, 12; Petr. Fragm. p. 872 Burm.; cf. Paul. ex F...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
fenestra
fenestra ae, f 1 FA-, an opening for light, window : fenestrarum angustiae: bifores, O.: iuncta, ...

An Elementary Latin Dictionary