iris ring

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• 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 — ► NOUN 1) a flat, coloured, ring shaped membrane behind the cornea of the eye, with an adjustable circular opening (pupil) in the centre. 2) a plant with sword shaped leaves and purple or yellow flowers. ORIGIN Greek, rainbow, iris …   English terms dictionary

• 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

• ring — 1. A circular band surrounding a wide central opening; a r. shaped or circular structure surrounding an opening or level area. SYN: anulus [TA]. 2. The closed ( i.e., endless) chain of atoms in a cyclic compound; commonly used for “cyclic” or… …   Medical 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-Heterochromie — Als Iris Heterochromie (Heterochromia iridis), auch Odd Eye(d), bezeichnet man die Verschiedenheit beider Regenbogenhäute der Augen durch Störung der Pigmentierung. Das betroffene Lebewesen hat folglich zwei verschiedene Augenfarben. Sie kommt… …   Deutsch Wikipedia

• Iris — The iris is the circular, colored curtain of the eye. Its opening forms the pupil. The iris helps regulate the amount of light that enters the eye. The eye has a number of other key components. These include the cornea, pupil, lens, retina,… …   Medical dictionary

• iris — noun 1》 a flat, coloured, ring shaped membrane behind the cornea of the eye, with an adjustable circular opening (pupil) in the centre. 2》 a plant with showy flowers, typically purple or yellow, and sword shaped leaves. [Genus Iris: many… …   English new terms dictionary

• Iris, speckled — Due to little white (or lightly colored) spots that are slightly elevated on the surface of the iris. These spots, arranged in a ring concentric with the pupil, occur in normal children but are far more frequent in Down’s syndrome (trisomy 21).… …   Medical dictionary

• iris — n. the part of the eye that regulates the amount of light that enters. It forms a coloured muscular diaphragm across the front of the lens; light enters through a central opening, the pupil. A ring of muscle round the margin contracts in bright… …   The new mediacal dictionary

• 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