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单词 aperture
释义

WordReference Random House Learner's Dictionary of American English © 2024
ap•er•ture /ˈæpɚtʃɚ/USA pronunciation   n. [countable]
  1. an opening, such as a hole, slit, or gap.
  2. OpticsAlso called ˈap•er•ture ˌstop. an opening that limits the amount of light that can enter the lens of a camera or telescope.

WordReference Random House Unabridged Dictionary of American English © 2024
ap•er•ture  (apər chər),USA pronunciation n. 
  1. an opening, as a hole, slit, crack, gap, etc.
  2. OpticsAlso called aperture stop′. an opening, usually circular, that limits the quantity of light that can enter an optical instrument.
  • Latin apertūra an opening, equivalent. to apert(us) opened (past participle of aperīre; aper(i)- (see aperient) + -tus past participle suffix) + -ūra -ure
  • 1400–50; late Middle English
ap•er•tur•al  (apər chŏŏr′əl),USA pronunciation adj.  aper•tured, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::
aperture /ˈæpətʃə/ n
  1. a hole, gap, crack, slit, or other opening
  2. a usually circular and often variable opening in an optical instrument or device that controls the quantity of radiation entering or leaving it
Etymology: 15th Century: from Late Latin apertūra opening, from Latin aperīre to open
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