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aperture |
Also found in: Dictionary/thesaurus, Medical, Legal, Wikipedia, Hutchinson | 0.02 sec. |
apertureAn 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 [′ap·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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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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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