aperture

名词 aperture:

1. a device that controls amount of light admitted
2. a natural opening in something
3. an man-made opening; usually small

1. A separation, an aperture, a fissure, or a short passage in an organ or a body part.
   裂孔，孔器官或身体部位中的孔隙、隙缝、裂隙或通道
2. A lid or flap covering an aperture, such as the gill cover in some fishes or the horny shell cover in snails or other mollusks.
   鳃盖覆盖在一孔或缝隙上的盖，如一些鱼类的鳃或覆盖在蛇或其它软体动物身上的角质壳
3. What aperture are you using?
   你使用多大的光圈?
4. The aperture in the door is so wide.
   门上的孔隙太大了。

ap.er.ture

n.（名词）
An opening, such as a hole, gap, or slit.
孔，洞：开口，如洞、缝隙或缺口

A usually adjustable opening in an optical instrument, such as a camera or a telescope, that limits the amount of light passing through a lens or onto a mirror.
光圈：光学仪器上的一个可调开口，如照相机或望远镜，它控制穿过镜头的或到镜面的光的数量
The diameter of such an opening, often expressed as an f-number.
孔径：这种开口的直径，常以f数表示
The diameter of the objective of a telescope.
孔径：望远镜物镜的直径

来源：
Middle English
中古英语
from Latin apertôra
源自 拉丁语 apertôra
from apertus [past participle of] aperore [to open] * see wer- 4
源自 apertus [] aperore的过去分词 [开，打开] *参见 wer- 4

【引伸】
ap.ertur.al
adj.（形容词）