[W/K] :: OS

  O \O\ ([=o]), n.; pl. O's or Oes ([=o]z).
     1. The letter O, or its sound. "Mouthing out his hollow oes
        and aes." --Tennyson.
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     2. Something shaped like the letter O; a circle or oval.
        "This wooden O [Globe Theater]". --Shak.
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     3. A cipher; zero. [R.]
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              Thou art an O without a figure.       --Shak.
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  Os \Os\, n. (Chem.)
     The chemical symbol for the element osmium.
     [PJC]

  Os \Os\, n.; pl. Ossa. [L.]
     A bone.
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  Os \Os\, n.; pl. Ora. [L.]
     A mouth; an opening; an entrance.
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  Os \Os\, n.; pl. Osar. [Sw. [*a]s ridge, chain of hills, pl.
     [*a]sar.] (Geol.)
     One of the ridges of sand or gravel found in Sweden, etc.,
     supposed by some to be of marine origin, but probably formed
     by subglacial waters. The osar are similar to the kames of
     Scotland and the eschars of Ireland. See Eschar.
     [1913 Webster]

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

  OS
       Operating System
       
       

  OS /O-S/ 1. [Operating System] n. An abbreviation heavily used in
     email, occasionally in speech. 2. n. obs. On ITS, an output spy. See
     "{OS and JEDGAR" in Appendix A.
  
  

  OS
       
          1. operating system.
       
          2. [obsolete, ITS], an output spy.  See "{OS and JEDGAR".
       
          3.  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.
       
          [{Jargon File]
       
          (1997-09-22)