Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. One who stubbornly adheres to outmoded or discredited ideas: "If you don't accept the ideas derived from Adam Smith ... then you are [considered] a flat-earther” ( James Fallows).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A person who believes or advocates the theory that the earth is flat.
  • n. A person who believes or advocates an outlandish, discredited theory; a person who refuses to acknowledge the truth despite overwhelming evidence.

Etymologies

From the long-discredited belief that the earth is flat.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

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