aperture

Etymology
From late, from , from. .

Noun

 * 1) A small or narrow opening, gap, slit, or hole.
 * 2)  A hole which restricts the diameter of the lightpath through one plane in an optical system.
 * 3)  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.
 * 4)  The (typically) large-diameter antenna used for receiving and transmitting radio frequency energy containing the data used in communication satellites, especially in the geostationary belt. For a comsat, this is typically a large reflective dish antenna; sometimes called an array.
 * 5)  The maximum angle between the two generatrices.
 * 1)  A hole which restricts the diameter of the lightpath through one plane in an optical system.
 * 2)  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.
 * 3)  The (typically) large-diameter antenna used for receiving and transmitting radio frequency energy containing the data used in communication satellites, especially in the geostationary belt. For a comsat, this is typically a large reflective dish antenna; sometimes called an array.
 * 4)  The maximum angle between the two generatrices.
 * 1)  The (typically) large-diameter antenna used for receiving and transmitting radio frequency energy containing the data used in communication satellites, especially in the geostationary belt. For a comsat, this is typically a large reflective dish antenna; sometimes called an array.
 * 2)  The maximum angle between the two generatrices.
 * 1)  The maximum angle between the two generatrices.

Usage notes

 * The aperture of microscopes is often expressed in degrees, called also the angular aperture, which signifies the angular breadth of the pencil of light which the instrument transmits from the object or point viewed; as, a microscope of 100° aperture.

Translations

 * Bulgarian: ,
 * Chinese:
 * Mandarin:
 * Danish: åbning
 * Dutch:
 * Finnish: ,
 * French:
 * Georgian: სანათური, ხვრელი,, ნაპრალი
 * German:
 * Greek:
 * Ancient: τρῆμα
 * Italian:
 * Japanese:
 * Latin:
 * Manx: towl
 * Maori: pūaha
 * Norwegian:
 * Bokmål:
 * Nynorsk: opning
 * Persian:
 * Polish:, ,
 * Portuguese:
 * Romanian:
 * Russian: ,
 * Slovene:
 * Spanish:
 * Swedish: ,


 * Afrikaans: stralingsvlak
 * Bulgarian: апертура
 * Chinese:
 * Mandarin:
 * Czech:
 * Danish: blænder
 * Dutch: ,
 * Finnish:
 * German:
 * Hungarian: ,
 * Japanese:
 * Macedonian: отвор
 * Norwegian:
 * Bokmål: irisblender
 * Nynorsk: irisblendar
 * Polish:, ,
 * Portuguese:
 * Russian:,  ,
 * Swedish: ,


 * Danish: blænder
 * Dutch: ,
 * Finnish: aukon halkaisija
 * French:
 * Georgian: სანათური
 * German: Blendenzahl
 * Irish: cró
 * Macedonian: отвор
 * Norwegian:
 * Bokmål: blenderåpning
 * Nynorsk: blendaropning, blendarop
 * Polish:
 * Portuguese:
 * Russian: ,
 * Slovene: apertura
 * Spanish:

Etymology
..

Noun

 * 1)  opening, openness,