oilionairen.
/ˌɔɪljəˈnɛː/, U.S. /ˈˌɔɪljəˈnɛ(ə)r/ colloquial (originally and chiefly U.S.).
A millionaire whose wealth is derived from oil.
ΚΠ
1925 Cumberland (Maryland) Evening Times 11 May 8/2 It was generally accepted that culture could be obtained only through wealth. That idea was punctured when oillionaires and other newrich rode roughshod into New York.
1949 Nevada State Jrnl. 9 Feb. 4/3 Bonita Granville and oillionaire groom at Theodore's.
1959 J. Adams It takes One to know One iii. 72 Some of those oillionaires are real cowboys—every spring they saddle up and roundup the banks.
1971 Time 1 Nov. 52/1 U.S. Oilionaire J. Paul Getty shook up the British art establishment..with his acquisition of Titian's The Death of Actaeon for about $4,200,000.
1983 The Mag. Mar. 17/1 Only oilionaires and call-girls live in Mayfair.
1998 Boston Globe (Nexis) 10 Apr. e1 A fictional television family of newly created oillionaires from Bug Tussle, W.Va.
This is a new entry (OED Third Edition, March 2004; most recently modified version published online March 2022).
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n.1925