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Definition of 'os'

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  1. a mouth or mouthlike opening
  2. a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
       Synonyms: osmium atomic number 76
  3. (computer science) software that controls the execution of computer programs and may provide various services
       Synonyms: operating system
  4. the left eye
       Synonyms: oculus sinister
  5. rigid connective tissue that makes up the skeleton of vertebrates
       Synonyms: bone

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