1. (n.) A thin film of liquid inflated with air or gas; as, a soap bubble; bubbles on the surface of a river.

2. (n.) A small quantity of air or gas within a liquid body; as, bubbles rising in champagne or aerated waters.

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

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

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

6. (n.) 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.

7. (n.) A person deceived by an empty project; a gull.

8. (n.) To rise in bubbles, as liquids when boiling or agitated; to contain bubbles.

9. (n.) To run with a gurgling noise, as if forming bubbles; as, a bubbling stream.

10. (n.) To sing with a gurgling or warbling sound.

air air pocket airy hope airy nothing apparition autism babble ball balloon be enthusiastic bilge bladder blain bleb blister blob blubber boil boil over boll bolus boss bow brainchild bubble over bubble up bubbles bulb bulbil bulblet bulge bulla bump bunch burble burl button cahot carbonation carry on over chaff chimera china chine chip churn clump cobweb condyle convex cork daydream deception delirium deluded belief delusion dereism dowel down dream dream vision dreamland dreamworld droplet dust ear effervesce effervescence eggshell eidolon ellipsoid enthuse ephemera ephemeral ephemerid ephemerides ephemeris ether fairy false belief fancy fantasque fantasy feather ferment fiction figment fizz fizzle flange flap flue fluff foam froth fuzz gall geoid glass glass house globe globelet globoid globule glomerulus gnarl go on over gob gobbet golden dream gossamer guggle gurgle gush gush over hallucination handle hill hiss house of cards hump hunch ice idle fancy ignis fatuus illusion imagery imagination imagining insubstantial image invention jog joggle knob knot knur knurl lap lather lip loop lump maggot make much of make-believe matchwood mayfly misbelief misconception mist moil mole mote mountain myth nevus nub nubbin nubble oblate spheroid old paper orb orbit orblet papilloma parchment peg pellet phantasm phantom piecrust pipe pipe dream plash plop prolate spheroid purl quixotic ideal rainbow rave rave about rhapsodize rib ridge ring ripple romance rondure seethe self-deceit self-deception self-delusion shadow shoulder sick fancy simmer slosh smoke smolder snows of yesteryear sparkle sphere spheroid spherule spine spirit splash sponge spume stir straw stud style suds swash swish tab take on over thick-coming fancies thin air thistledown trick trill trip tubercle tubercule unreal hope utopia vapor verruca vesicle vision wale wart wash welt whim whimsy wildest dreams work wrong impression