ось

In the sense of "operating system", is an adaptation of the English acronym OS in the same sense.

ось • (osʹ) f inan (genitive о́си, nominative plural о́си, genitive plural осе́й, relational adjective осево́й)

axis
- 1967, “Song about Bears”, in Кавка́зская пле́нница [Kidnapping, Caucasian Style]‎ (film):
  Где́-то на бе́лом све́те, / Та́м, где всегда́ моро́з, / Тру́тся спино́й медве́ди / О земну́ю о́сь. / Ми́мо плыву́т столе́тья, / Спя́т подо льдо́м моря́, / Тру́тся об о́сь медве́ди, / Ве́ртится земля́.
  Gdé-to na bélom svéte, / Tám, gde vsegdá moróz, / Trútsja spinój medvédi / O zemnúju ósʹ. / Mímo plyvút stolétʹja, / Spját podo lʹdóm morjá, / Trútsja ob ósʹ medvédi, / Vértitsja zemljá.
  Somewhere in the world, / Where it is always cold, / Bears are rubbing their backs, / Against the earth's axis. / The centuries are swimming by, / The seas are sleeping under the ice, / Bears are rubbing against the axis, / The earth is spinning.
axle
(computer slang) operating system

More information singular, plural ...

Pre-reform declension of ось (inan fem-form 3rd-decl accent-e/fʺ)

More information singular, plural ...

Vasmer, Max (1964–1973), “ось”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress
Chernykh, P. Ja. (1999), “ось”, in Историко-этимологический словарь русского языка [Historical-Etymological Dictionary of the Russian Language] (in Russian), 3rd edition, volume 1 (а – пантомима), Moscow: Russian Lang., →ISBN, page 609
Sreznevsky, Izmail I. (1902), “ось”, in Матеріалы для Словаря древне-русскаго языка по письменнымъ памятникамъ [Materials for the Dictionary of the Old East Slavic Language Based on Written Monuments]‎ (in Russian), volume 2 (Л – П), Saint Petersburg: Department of Russian Language and Literature of the Imperial Academy of Sciences, column 752

Russian