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aperture

   Also found in: Dictionary/thesaurus, Medical, Legal, Wikipedia, Hutchinson 0.02 sec.

aperture

An orifice. It often refers to an opening in which light is allowed to pass in optical systems such as cameras and lasers. See f-stop and numerical aperture.


aperture
Physics
a. a usually circular and often variable opening in an optical instrument or device that controls the quantity of radiation entering or leaving it
b. the diameter of such an opening

aperture [′apĀ·ə‚chər]
(electronics)
An opening through which electrons, light, radio waves, or other radiation can pass.
(graphic arts)
A rectangular cutout on an aperture card.
(optics)
The diameter of the objective of a telescope or other optical instrument, usually expressed in inches, but sometimes as the angle between lines from the principal focus to opposite ends of a diameter of the objective.


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In the trap-door itself was found a square aperture cut in the wood, apparently with some exceedingly sharp instrument, just behind the bolt which fastened the door on the inner side.
The little pink sloth-creature was still blinking at me when my Ape-man reappeared at the aperture of the nearest of these dens, and beckoned me in.
he had said for the third time, to his comedians, speaking machines; then as he was marching with great strides in front of the marble table, a fancy seized him to go and appear in his turn at the aperture of the chapel, were it only for the pleasure of making a grimace at that ungrateful populace.
 
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