| Fenestra (n.) A small opening; esp., one of the apertures, closed by membranes, between the tympanum and internal ear. Thesaurus Entries aperture, broaching, cavity, chasm, check, clearing, cleft, crack, disclosure, fistula, fontanel, foramen, gap, gape, gat, gulf, hiatus, hole, hollow, inlet, interval, lacuna, laying open, leak, opening, opening up, orifice, outlet, passageway, pore, slot, space, split, stoma, throwing open, uncorking, unstopping, yawn |