Aperture



GRE Barron

解释

GRE 红宝书

• n. 孔隙, 窄的缺口
• ［英］ n. 孔隙, 窄的缺口 ( an opening; hole; gap)
• ［记］ aper=open ( 开) +ture -> 开口 -> 孔

Webster Collegiate

noun

• Etymology: Middle English, from Latin apertura, from apertus, past participle of aperire to open
• Date: 15th century
• 1. an opening or open space ; hole
• 2.
  • a. the opening in a photographic lens that admits the light
  • b. the diameter of the stop in an optical system that determines the diameter of the bundle of rays traversing the instrument
  • c. the diameter of the objective lens or mirror of a telescope

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