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 ?
11) Isolated PAIS due to an os trigonum or hypertrophic posterior process of the talus in dancers is surgically approached laterally.
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).
Talus und das os trigonum bardelebens beim Menschen.
Os trigonum sendromunun nadir goruldugu vurgulanmakla birlikte bu konuyla ilgili yeterli epidemiyolojik veriler bulunmamaktadir.
4) When the os trigonum is the cause, the condition is known as os trigonum syndrome.
6) However, impressed by the endoscopic overview of the hindfoot pathology and the resulting insights into the intimate relationship between the os trigonum and the FHL tendon, and after extensive training, the endoscopic approach was adopted as standard treatment in our clinic in 2002.
The os trigonum is corticated and articulates with the lateral talar tubercle through a synchondrosis.
Howse in 1972 was the first author to describe os trigonum syndrome in dancers and the result of surgical treatment: "excision of the extra bone relieves the symptoms.
37) Posterior tibiotalar impingement syndrome (PTTIS) can occur in the presence of an os trigonum (Figure 20), a prominent stieda process, or hypertrophy of the transverse ligament (the inferior portion of the PTFL).
Endoscopic excision of symptomatic os trigonum in professional dancers.
It occurs in 8 to 10 percent of the general population, with a 50 percent chance of it occurring in both ankles if you already have one os trigonum.
Previous studies have compared the outcomes after open and endoscopic excision of an os trigonum in patients of mixed professions.