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volatile

Source : Webster's Revised Unabridged Dictionary (1913)

Volatile \Vol"a*tile\, a. [F. volatil, L. volatilis, fr. volare
   to fly, perhaps akin to velox swift, E. velocity. Cf.
   {Volley}.]
   1. Passing through the air on wings, or by the buoyant force
      of the atmosphere; flying; having the power to fly. [Obs.]

   2. Capable of wasting away, or of easily passing into the
      a["e]riform state; subject to evaporation.

   Note: Substances which affect the smell with pungent or
         fragrant odors, as musk, hartshorn, and essential oils,
         are called volatile substances, because they waste away
         on exposure to the atmosphere. Alcohol and ether are
         called volatile liquids for a similar reason, and
         because they easily pass into the state of vapor on the
         application of heat. On the contrary, gold is a fixed
         substance, because it does not suffer waste, even when
         exposed to the heat of a furnace; and oils are called
         fixed when they do not evaporate on simple exposure to
         the atmosphere.

   3. Fig.: Light-hearted; easily affected by circumstances;
      airy; lively; hence, changeable; fickle; as, a volatile
      temper.

            You are as giddy and volatile as ever. --Swift.

   {Volatile alkali}. (Old Chem.) See under {Alkali}.

   {Volatile liniment}, a liniment composed of sweet oil and
      ammonia, so called from the readiness with which the
      latter evaporates.

   {Volatile oils}. (Chem.) See {Essential oils}, under
      {Essential}.

Volatile \Vol"a*tile\, n. [Cf. F. volatile.]
   A winged animal; wild fowl; game. [Obs.] --Chaucer. --Sir T.
   Browne.

Source : WordNet®

volatile
     adj 1: evaporating readily at normal temperatures and pressures;
            "volatile oils"; "volatile solvents" [ant: {nonvolatile}]
     2: liable to lead to sudden change or violence; "an explosive
        issue"; "a volatile situation with troops and rioters
        eager for a confrontation" [syn: {explosive}]
     3: marked by erratic changeableness in affections or
        attachments; "fickle friends"; "a flirt's volatile
        affections" [syn: {fickle}]
     4: tending to vary often or widely; "volatile stocks";
        "volatile emotions"
     n : a volatile substance; a substance that changes readily from
         solid or liquid to a vapor; "it was heated to evaporate
         the volatiles"

Source : Free On-Line Dictionary of Computing

volatile
     
        1.  {volatile variable}.
     
        2.  See {non-volatile storage}.
     
        (1997-06-05)
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