noun A spherically contained volume of air or other gas in a liquid, commonly a soapy liquid.
noun A small spherical cavity in a solid material.
bubbles in window glass, or in a lens
noun Anything resembling a hollow sphere.
noun Anything lacking firmness or solidity; a cheat or fraud; an empty project.
noun A period of intense speculation in a market, causing prices to rise quickly to irrational levels as the metaphorical bubble expands, and then fall even more quickly as the bubble bursts.
real estate bubble
noun The emotional or physical atmosphere in which a subject is immersed; especially, a homogeneous atmosphere in which subjects are spared exposure to culture or ideas different from their own.
noun An officer's station in a prison dormitory, affording views on all sides.
noun Someone who has been ‘bubbled’ or fooled; a dupe.