OS

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Os,

symbol for the element osmiumosmium
, metallic chemical element; symbol Os; at. no. 76; at. wt. 190.23; m.p. 3,045±30°C;; b.p. 5,027±100°C;; sp. gr. 22.57 at 20°C;; valence usually +0 to +8.
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Os

(chemistry)

OS

(1)

OS

(2)
[obsolete, ITS], an output spy. See "OS and JEDGAR".

OS

(operating system)
An operating system from IBM for their System/360 line of hardware announced in 1964. OS was planned with several flavours that were supposed to be compatible. OS was late, memory hungry and not able to reach the marketing objectives of IBM for the 360/30, the planned successor of the IBM 1401. IBM then decided to design a new operating system for the low end machines which they called DOS/360.

OS

(Operating System) The master control program in a computer or mobile device. The O-S acronym has been part of the names of various operating systems. Microsoft used DOS for many years in the PC, and Apple used OS 8, OS 9 and OS X in the Mac. For the major functions operating systems perform, see operating system. Some of the operating systems in this encyclopedia that have O-S in their name are TOS, DOS, PC-DOS, MS-DOS, DR-DOS, Mac OS, Mac OS X, iOS, OS/390 and OS/400.
References in periodicals archive ?
En algunos casos puede producirse el sindrome Os trigonum o sindrome de pinzamiento posterior, el cual se caracteriza por un dolor agudo o cronico de la region posterior del tobillo, y participan la porcion posterodistal de la tibia, la tuberosidad del calcaneo, el tuberculo posterior del calcaneo, la capsula, la membrana sinovial y el tendon del musculo flexor del primer dedo (Zaragoza-Velasco & Fernandez-Tapia, 2013).
(11) Isolated PAIS due to an os trigonum or hypertrophic posterior process of the talus in dancers is surgically approached laterally.
However, presences of chronic polyarthritis and progressive loss of joint motions with enlargement of the metacarpal and phalangeal epiphyses, mega os trigonum and spinal abnormalities including platyspondyly make our case an exceptional and interesting one.
(4,6,16) Examples of structures that can be compressed and can cause the development of symptoms are: an os trigonum (17), a prominent posterolateral process of the talus (4), an enlarged posterior process of the calcaneus (7), the posterior intermalleolar ligament (18), soft-tissue impingement (19), anomalous muscles (20), loose bodies, fractures of the ossicle or talar process, calcified inflammatory tissue, a low-lying flexor hallucis longus muscle belly and thickening of the capsule (7,8).
The Symptomatic Os Trigonum. J4M4.1967;201(11):882.
Os trigonum sendromunun nadir goruldugu vurgulanmakla birlikte bu konuyla ilgili yeterli epidemiyolojik veriler bulunmamaktadir.
Posterior-ankle impingement syndrome due to os trigonum syndrome
Diagnosis is clinical for the most part, but plain x-ray films may confirm the presence of an os trigonum. Magnetic resonance imaging (MRI) is warranted for patients with persistent symptoms; it may reveal a hypertrophied synovial lining or other pathology (such as osteochondritis).
Hindfoot endoscopy enables an overview of the intimate relationship between the os trigonum (or posterior [Stieda's] process of the talus) and the FHL tendon and allows for good judgment of the posterior ankle pathology.
In approximately 7% of the population, it remains separate and is referred to as the os trigonum. The os trigonum is corticated and articulates with the lateral talar tubercle through a synchondrosis.
In his book Diseases and Injuries of Ballet Dancers, published in 1982, he described operative treatment of FHL tendinopathy and posterior impingement of an os trigonum or hypertrophic posterior process of the talus (Stieda's process).
My doctor wants me to get a sonogram-guided injection of cortisone to reduce the inflammation surrounding my os trigonum, a pea-sized extra bone in the back of my ankle.