aperture englannista suomeksi
An opening, gap, or hole, usually small and narrow
1860, (w), ''Sea and River-side Rambles in Victoria'' Chapter 7
- In the centre of the fleshy membrane is an aperture leading into a deep cavity, at the bottom of which is placed a prominent piston that may be retracted by muscular fibres provided for the purpose.
(quote-book)|title=On the Classification and Geographical Distribution of the Mammalia|location=London|publisher=J. W. Parker and Son|page=29|pageurl=https://books.google.com/books?id=a6E-AAAAcAAJ&pg=PA29|passage=Were the larynx of the little creature like that of the parent, the milk might—probably would—enter the windpipe and cause suffocation : but the fœtal larynx is cone-shaped, with the opening at the apex, which projects, as in the whale-tribe, into the back aperture of the nostrils, where it is closely embraced by muscles of the ‘soft palate.’
Something which restricts the diameter of the light path through one plane in an optical system.
The diameter of the aperture (in the sense above) which restricts the width of the light path through the whole system. For a telescope, this is the diameter of the objective lens.
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 antenna; sometimes called an ''array''.
The maximum angle between the two generatrices.
''If the generatrix makes an angle θ to the axis, then the aperture is 2θ.''
(es-verb form of)