EnglishEdit

NounEdit

O.S. (countable and uncountable, plural O.S.'s)

  1. (countable, computing) Initialism of operating system.
  2. (calendar systems) Abbreviation of Old Style.
  3. (eyewear) Initialism of oculus sinister; (the left eye from the patient's point of view)

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LatinEdit

NounEdit

O.S. m (indeclinable)

  1. (Can we verify(+) this sense?) (eyewear) O.S. (oculus sinister) (the left eye from the patient's point of view)

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