Hypertext Webster Gateway: "bonanza"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Bonanza \Bo*nan"za\, n. [Sp., prop. calm., fair weather,
prosperity, fr. L. bonus good.]
In mining, a rich mine or vein of silver or gold; hence,
anything which is a mine of wealth or yields a large income.
[Colloq. U. S.]
From WordNet (r) 1.7 (wn)
bonanza
n 1: an especially rich vein of precious ore
2: a sudden happening that brings very good fortune [syn: {boom},
{manna from heaven}]
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