iris diaphragm
noun Date: 1867 an adjustable diaphragm of thin opaque plates that can be turned by a ring so as to change the diameter of a central opening usually to regulate the aperture of a lens

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • Iris diaphragm — I ris di a*phragm An adjustable diaphragm, reminiscent of the iris of the eye in its action, by which the diameter of an approximately circular opening may be controlled, as for regulating the aperture of a lens; it consists of a number of… …   The Collaborative International Dictionary of English

  • iris diaphragm — n an adjustable diaphragm of thin opaque plates that can be turned by a ring so as to change the diameter of a central opening usu. to regulate the aperture of a lens (as in a microscope) …   Medical dictionary

  • iris diaphragm — n. a device consisting of thin, overlapping metal blades that can be adjusted to form an aperture of varying size for camera lenses, etc.: see MICROSCOPE …   English World dictionary

  • iris diaphragm — noun diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening • Syn: ↑iris • Hypernyms: ↑diaphragm, ↑stop * * * noun : an adjustable diaphragm of thin opaque plates that can be turned by a… …   Useful english dictionary

  • iris diaphragm — vyzdinė diafragma statusas T sritis fizika atitikmenys: angl. iris diaphragm vok. Irisblende, f rus. ирисовая диафрагма, f pranc. diaphragme iris, m …   Fizikos terminų žodynas

  • iris diaphragm — Optics, Photog. a composite diaphragm with a central aperture readily adjustable for size, used to regulate the amount of light admitted to a lens or optical system. Also called iris. [1885 90] * * * …   Universalium

  • iris diaphragm — /ˈaɪrəs daɪəfræm/ (say uyruhs duyuhfram) noun a composite diaphragm with a central aperture readily adjustable for size, used to regulate the amount of light admitted to a lens or optical system. Also, iris …   Australian English dictionary

  • Iris (diaphragm) — An iris is a mechanism that is used as a compact solution to close and open holes. Iris mechanisms are commonly found in optical shutters (diaphragms), and also in various kinds of valves. Irises are sometimes used in science fiction as doors. ee …   Wikipedia

  • iris diaphragm — i′ris di aphragm n. opt pht a composite diaphragm with a central aperture readily adjustable for size, used to regulate the amount of light admitted to a lens or optical system • Etymology: 1885–90 …   From formal English to slang

  • Iris diaphragm — Ирисовая диафрагма …   Краткий толковый словарь по полиграфии

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