Black's Law Dictionary (2nd edition)dictionaries

Bubble

An extravagant or unsubstan-tial project for extensive operations lu busl-ness or commerce, generally founded on a fictitious or exaggerated prospectus, to ensnare unwary investors. Companies formed on such a basis or for such purposes are called “bubble companies.” The term is chiefly used in England

Source: Black's Law Dictionary 2nd Ed (1910)