Mormon

Concise Oxford English Dictionary © 2008 Oxford University Press:
Mormon /ˈmɔːmən/

▶noun a member of the Church of Jesus Christ of Latter-Day Saints, a religion founded in the US in 1830 by Joseph Smith Jr.

– derivatives
Mormonism noun.

– origin the name of a prophet to whom Smith attributed The Book of Mormon, a collection of supposed revelations.