\ˈa͡ɪɹɪs], \ˈaɪɹɪs], \ˈaɪ_ɹ_ɪ_s]\
Definitions of IRIS
- 2006 - WordNet 3.0
- 2011 - English Dictionary Database
- 2010 - New Age Dictionary Database
- 1913 - Webster's Revised Unabridged Dictionary
- 1919 - The Concise Standard Dictionary of the English Language
- 2010 - Medical Dictionary Database
- 1919 - The Winston Simplified Dictionary
- 1920 - A practical medical dictionary.
- 1898 - Warner's pocket medical dictionary of today.
- 1899 - The american dictionary of the english language.
- 1894 - The Clarendon dictionary
- 1920 - A dictionary of scientific terms.
- 1846 - Medical lexicon: a dictionary of medical science
- 1898 - American pocket medical dictionary
- 1916 - Appleton's medical dictionary
- 1871 - The Cabinet Dictionary of the English Language
- 1790 - A Complete Dictionary of the English Language
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By Princeton University
By DataStellar Co., Ltd
By Oddity Software
By Noah Webster.
By James Champlin Fernald
By DataStellar Co., Ltd
By William Dodge Lewis, Edgar Arthur Singer
1. The anterior division of the vascular tunic of the eye, a disc-like diaphragm, perforated in the center (the pupil), attached marginally to the ciliary body; it is composed in large part of muscular tissue by which the size of the pupil is regulated. 2. Blue flag, flag lily, iris versicolor (N.F.), the dried rhizome and roots of iris versicolor; occasionally employed as a cathartic and hepatic stimulant like podophyllum, in doses of gr. 10-20 (0.6-1.3). 3. (N.F.) Orris root, the rhizome of Iris florentina, I. germanica, or I. pallida; employed in the manufacture of various toilet articles. 4. Occurring in concentric rings, noting certain skin lesions, such as erythema iris.
By Stedman, Thomas Lathrop
By William R. Warner
By Daniel Lyons
By William Hand Browne, Samuel Stehman Haldeman
By Henderson, I. F.; Henderson, W. D.
So called from its resembling the rainbow in a variety of colours. A membrane, stretched vertically at the anterior part of the eye, in the midst of the aqueous humour, in which it forms a kind of circular, flat partition, separating the anterior from the posterior chamber. It is perforated by a circular opening called the pupil, which is constantly varying its dimensions, owing to the varying contractions of the fibres of the iris. Its posterior surface has been called uvea, from the thick, black varnish which covers it. The pigmentary stratum, on its free surface, appears to be bounded by a delicate, but sharply defined, line, which has been described as a special. The greater circumference of the iris is adherent to the ciliary processes and circle. It has an external plane of radiated fibres and an internal one of circular fibres, which serve- the one to dilate, the other to contract the aperture of the pupil. The iris receives the irian nerves. Its arteries are furnished by the long ciliary arteries, which form two circles by their anastomoses; the one very broad, near the great circumference; the other, smaller, and seated around the circumference of the pupil. The veins of the iris empty themselves into the Vasa vorticosa, and into the long ciliary veins. The use of the iris seems to be, - to regulate by its dilatation or contraction, the quantity of luminous rays necessary for distinct vision. The different colours of the iris occasion the variety hi the colours of the human eye.
By Robley Dunglison
By Willam Alexander Newman Dorland
A thin, circular, contractile membrane, hanging vertically like a curtain in the anterior chamber of the eye. Its posterior surface is covered with pigment. It contains a set of circular muscular fibers, the sphincter, which contracts the pupil; and radiating fibers of elastic tissue which dilate the pupil.
By Smith Ely Jelliffe
Word of the day
- An English poet; born Greenwich, 29, 1821; died at Rowfant, May 30, 1895. He wrote "society verses", among them :"London Lyrics"(1857); "Lyra Elegantiarum"(1867); "Patchwork"(1879).