English Explanatory Dictionary

aperture

English dictionary entry

Meanings

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.

Pronunciation

/ˈap.ə.t͡ʃə/ /ˈap.ə.tjʊə/ LL-Q1860 (eng)-Vealhurl-aperture.wav /ˈæp.ɚˌt͡ʃʊɹ/ /ˈæp.ɚ.t͡ʃɚ/ /ˈæp.ɚˌtjʊɹ/ /ˈæp.ɚˌtʊɹ/

Word forms

aperture apertures

Etymology

From late Middle English, from Latin apertūra (“an opening”), from aperiō (“to uncover, make or lay bare”) + -tūra (“-ure”, action noun suffix). Doublet of overture and apertura.

Related words

aperient apéritif aperitive apert apertion apertly

Derived words

apertometer apertural aperturate apertured apertureless aperture membrane aperture priority aperture-priority ectoaperture endoaperture macroaperture multiaperture nanoaperture pyriform aperture subaperture

Translations

Afrikaans: stralingsvlak Bulgarian: апертура Chinese Mandarin: 光圈 Czech: clona Danish: blænder Dutch: diafragma Dutch: opening Finnish: aukko Finnish: aukon halkaisija German: Blende German: Blendenzahl Hindi: द्वारक Hungarian: blende Hungarian: rekesz Japanese: 開口 Macedonian: отвор Norwegian Bokmål: irisblender Norwegian Bokmål: blenderåpning Norwegian Nynorsk: irisblendar Norwegian Nynorsk: blendaropning Norwegian Nynorsk: blendarop Polish: przesłona Polish: przysłona Polish: apertura Portuguese: abertura Russian: затвор Russian: обтюратор Russian: диафра́гма Russian: апертура Spanish: apertura Spanish: abertura Swedish: bländare Swedish: apertur French: ouverture Georgian: სანათური Irish: cró Slovene: apertura
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