Source : Webster's Revised Unabridged Dictionary (1913)

Bubble \Bub"ble\, n. [Cf. D. bobbel, Dan. boble, Sw. bubbla. Cf.
   {Blob}, n.]
   1. A thin film of liquid inflated with air or gas; as, a soap
      bubble; bubbles on the surface of a river.

            Beads of sweat have stood upon thy brow, Like
            bubbles in a late disturbed stream.   --Shak.

   2. A small quantity of air or gas within a liquid body; as,
      bubbles rising in champagne or a["e]rated waters.

   3. A globule of air, or globular vacuum, in a transparent
      solid; as, bubbles in window glass, or in a lens.

   4. A small, hollow, floating bead or globe, formerly used for
      testing the strength of spirits.

   5. The globule of air in the spirit tube of a level.

   6. Anything that wants firmness or solidity; that which is
      more specious than real; a false show; a cheat or fraud; a
      delusive scheme; an empty project; a dishonest
      speculation; as, the South Sea bubble.

            Then a soldier . . . Seeking the bubble reputation
            Even in the cannon's mouth.           --Shak.

   7. A person deceived by an empty project; a gull. [Obs.]
      ``Ganny's a cheat, and I'm a bubble.'' --Prior.

Bubble \Bub"ble\, v. i. [imp. & p. p. {Bubbled}; p. pr. & vb. n.
   {Bubbling}.] [Cf. D. bobbelen, Dan. boble. See {Bubble}, n.]
   1. To rise in bubbles, as liquids when boiling or agitated;
      to contain bubbles.

            The milk that bubbled in the pail.    --Tennyson.

   2. To run with a gurgling noise, as if forming bubbles; as, a
      bubbling stream. --Pope.

   3. To sing with a gurgling or warbling sound.

            At mine ear Bubbled the nightingale and heeded not.
                                                  --Tennyson.

Source : WordNet®

bubble
     n 1: a hollow globule of gas (e.g., air or carbon dioxide)
     2: a speculative scheme that depends on unstable factors that
        the planner cannot control; "his proposal was nothing but
        a house of cards"; "a real estate bubble" [syn: {house of
        cards}]
     3: an impracticable and illusory idea; "he didn't want to burst
        the newcomer's bubble"
     4: a dome-shaped covering made of transparent glass or plastic

bubble
     v 1: form, produce, or emit bubbles; "The soup was bubbling"
     2: flow in an irregular current with a bubbling noise;
        "babbling brooks" [syn: {ripple}, {babble}, {guggle}, {burble},
         {gurgle}]
     3: expel gas from the stomach; "In China it is polite to burp
        at the table" [syn: {burp}, {belch}, {eruct}]