aperture
A small or narrow opening, gap, slit, or hole.
Other meanings
A hole which restricts the diameter of the lightpath through one plane in an optical system.
The diameter of such a hole which restricts the width of the lightpath through the whole system. For a telescope, this is the diameter of the objective lens.
A kind of
- opening
Kinds of aperture
- mouthpiece
Word history
From Latin "apertūra" (an opening).
Where this comes from
This definition is adapted from “aperture” on Wiktionary, by its contributors; related-word lists use Open English WordNet (CC BY 4.0, based on Princeton WordNet), published under CC BY-SA 4.0. This page is published under the same licence.