Early 18th century; earliest use found in Edward Ward (1667–1731), satirist. From Mammon + -ite, probably after biblical ethnonyms such as Ammonite (Deuteronomy 2:20, etc.).
Definition of Mammonite in US English:
Mammonite
nounˈmamənʌɪt
Mammonist.
Origin
Early 18th century; earliest use found in Edward Ward (1667–1731), satirist. From Mammon + -ite, probably after biblical ethnonyms such as Ammonite (Deuteronomy 2:20, etc.).