zillionaire

[zil-yuh-nair]
noun Informal.
a person of incalculably great wealth.

Origin:
1945–50; zillion + (million)aire

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Yet zillionaire bankers claimed that they had no idea housing prices could possible drop even a few percent.
The film does not enhance its credibility by making the zillionaire rock star's life one of unadulterated gloom.
Now, under his auspices, a zillionaire comic would perform a kind of bee bungee jump.
But, its average income could be high, thanks to that one multi-zillionaire.
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