Zillionaire Definition
 zĭlyə-nâr 
    noun
  
 A person regarded as having virtually immeasurable wealth.
 Webster's New World 
(humorous) An incredibly rich person.
Wiktionary 
Other Word Forms of Zillionaire
Noun
Singular:
 zillionairePlural:
 zillionairesOrigin of Zillionaire
-  
From zillion and modelled on millionaire
From Wiktionary
 zillion (million)aire
From American Heritage Dictionary of the English Language, 5th Edition
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