| Answer | Crossword Clue |
|---|---|
| reaming | to widen the opening of (a hole) countersink |
| fenestrae | A small natural hole or opening, esp. in a bone. The mammalian middle ear is linked by the fenestra ovalis to the vestibule of the inner ear, and by the fenestra rotunda to the cochlea |
| fenestra | A small natural hole or opening, esp. in a bone. The mammalian middle ear is linked by the fenestra ovalis to the vestibule of the inner ear, and by the fenestra rotunda to the cochlea |
| countersink | to make a countersink on (a hole) |
| countersank | COUNTERSINK, to make a countersink on (a hole) |
| through | So as to make a hole or opening in (a physical object) |
