a thin film of liquid inflated with air or gas; as, a soap bubble; bubbles on the surface of a river.-a small quantity of air or gas within a liquid body; as, bubbles rising in champagne or aerated waters.-a globule of air, or globular vacuum, in a transparent solid; as, bubbles in window glass, or in a lens.-a small, hollow, floating bead or globe, formerly used for testing the strength of spirits.-the globule of air in the spirit tube of a level.-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.-a person deceived by an empty project; a gull.-to rise in bubbles, as liquids when boiling or agitated; to contain bubbles.-to run with a gurgling noise, as if forming bubbles; as, a bubbling stream.-to sing with a gurgling or warbling sound.