aperture
ap·er·ture
/ˈæpɚʧɚ/ noun , pl -tures [ count ]
1 formal : a hole or small opening in something
We entered the cave through a narrow aperture.
2 technical : an opening that controls the amount of light that passes through a lens (such as a camera lens)
The photograph was taken using a fast shutter speed and a large aperture.
