Definition from Wiktionary, the free dictionary
- belief that the Earth's shape is a plane or disk.
2001 August 6, Steven J., “Re: Platyg?nism”, talk.origins, Usenet:
- According to Ron Numbers's _The Creationists_, geocentrism remained common among Missouri synod Lutherans until about a century ago (and still has followers in various sects). Platygaeanism had its adherents until recently, at least.