aperture
(noun)
noun
1. a device that controls amount of light admitted
Definition categories: man–made, regulator
2. a natural opening in something
Definition categories: object, hole
3. an man-made opening; usually small
Definition categories: man–made, opening
Sentences with aperture as a noun:
- If the generatrix makes an angle θ to the axis, then the aperture is 2θ.