The story
From fundamentalist + Church of Jesus Christ of Latter-day Saints.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A denomination of Mormonism, widely known for practising polygamy, which split from the main church over the issue of the banning of plural marriage, seen to be placating the United States government on secular worldly issues, and compromising the true faith. Full definition →
From fundamentalist + Church of Jesus Christ of Latter-day Saints.
Etymology from Wiktionary, CC BY-SA 4.0.